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571_sch_1A02


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                 6                                              5                                                             4                                                                3                                                  2                                                                   1
                                                                                                                                                                                                                                                                                                   REVISION RECORD
                                                                                                                                                                                                                                                                     LTR               REVISIONS DONE OR ECO NUMBER:                         DATE:

                                           R151                                                                                                                                                                                                                      F6        Changed C62 and 63 to 22uF/25V non-polar.                  9/13/95
                                                            PHANTOM_PWR                                                                                                                                                                                                                                                          B
                                                                                                                                                                                                                                                                     0.1       U.L. & other modifications.                        A
                                                                                                                                                                                                                                                                                                                                      S   2/2/96
                                          221 OHM           (SH1, C5)
                                                            (SH2, C4)                                                                                                                                                                                                0.2       U.L. & other mods, take #2...
                                                                                                                                                                                                                                                                                                                                 B
                                                                                                                                                                                                                                                                                                                                  A       05/02/96
                                                                                                                                                                                                                                                                                                                                      S
                           C68                        R5                    C3               C4                                                       C5
                                    R1                                                                                                                                                                                                                                         Del TP5 (Sh2), rename TP1 (Sh4) RS232, chg
D   SENSE MIC 1                  100 OHM            100 OHM
                                                                                                                                                                                                                                                                     A00       R9, 20 from 4K99 > 1K00; R33 3K01 > 1K37.
                                                                                                                                                                                                                                                                                                                                 B


                                                                                                                                                                                                                                                                                                                                 R
                                                                                                                                                                                                                                                                                                                                  A
                                                                                                                                                                                                                                                                                                                                      S   07/23/96
                                                                                                                                                                                                                                                                                                                                                     D
                          47NP                                          330pF               4.7NP                                                 .001uF                                                                                                             A01       Change R11 to 1K00, C5 to .001uF                   B       10/15/96
             J1                                   C1                                                                                                                                                                                                                     Change R10,21 from 499 to 100 Ohm.
        XLR-FEMALE        R3                                                 R7                                                                       R11                                                                                                            A02 Change R11 from 1K to 4K99.                             RB       10/14/97
                                                  470pF
                          1K00
                   2              C65                                                                                                                              NOTE: Gain boosted 14dB                                                                                     Note: PCB remains at A.01
        1                                                                   49K9                                                                      4K99
                   3                                                                                           3   CW
                                                                    2         U1A       SENSE 1                     2
                                                                                                                          R9
                                                                                                                                             6          U1B
                                  47NP                                                                  R8A
            4             R4
                                                  C2
                                                                        -           1    TRIM          10KB
                                                                                                                                                  -           7
                                                                    3                                                    1K00                5                       TP1
                          1K00                                                       (FRONTPANEL
                                                  470pF                 +                                                                         +
                                                                              BA4560 ADJ. TRIMMER)             1                                        BA4560
                           C69      R2                R6
                                                                                                         R10
                          47NP   100 OHM            100 OHM                                         100 OHM
                                                                  R12               C6                                                                                                                                                                                                        +15VA
      NOTE:                                                       49K9              330pF
      J6 (Sh 2) Disables phantom power for all mics.
      Remove R151 and/or R152 to                                                                                                                                                                                                                                                                  CW   3          SYMMETRY ADJ.
      disable phantom power for                                                                                                                                                                                                                                                               2                      (TRIMMER)
      Sense Mic 1 and/or 2 only.                                                                                                                                                                                                                                                                           R26
C                                          R152
                                                                                                                                                                                               R23             R24

                                                                                                                                                                                                                                                                                                       1
                                                                                                                                                                                                                                                                                                           100K
                                                                                                                                                                                                                                                                                                                                                     C
                                                                                                                                                                                               10K0            2K00                                      C16
                                                            PHANTOM_PWR
                                          221 OHM           (SH1, D5)                                                                                                                                       C12                                                                      R27
                                                            (SH2, C4)                                                                                                                                       .0022uF                                       +                          100K0
                           C70                                               C9             C10                                                                                                                                                       10/35                                       -15VA
                                    R13               R17
                                                                                                                                                                                                                                                      R30
    SENSE MIC 2                  100 OHM            100 OHM
                                                                                                                                                                                                                                                                                       R28
                          47NP                                          330pF               4.7NP
            J2                                    C7                                                                                                                                                                                                  2M2
        XLR-FEMALE        R15                                            R19                                                                                                                                                                                                           1K37
                          1K00                    470pF
                   2              C66                                                                                                                                                                                                                             6              4
                                                                            49K9                                                                                                                                                              -15VA
        1                                                                                                                                                                                                                           C13                         CAP             SYM
                   3                                                          U2A                                                                                                                                                                                        U3A
                                                                    2                                3                                                                                                                                                     1                           7
                                  47NP                                  -           1   SENSE 2                    CW
                                                                                                                         R20                             R33               R34                                                                                 IN         OUT
                          R16                                                                                       2
            4
                          1K00
                                                  C8                3
                                                                        +
                                                                                          TRIM R144A                                                                                                                                .1uF                            THAT2252
                                                  470pF                       BA4560 (FRONTPANEL 10KB                    1K00                           1K37             20K0                                                              R31                      BIAS       GND
                           C71     R14                R18                            ADJ. TRIMMER)    1                                                                                                                                    73K2
                                                                                                                                                                             C18                                                                                     2           3
                                                                                                                    R21
B                         47NP   100 OHM            100 OHM
                                                                  R22               C11
                                                                                                                    100 OHM
                                                                                                                                                                         150pF
                                                                                                                                                                                                                                                                                                                                                     B
                                                                  49K9              330pF                                                                                                                                                          C15                   R29
                                                                                                                                                                             D1                                                                   .1uF                   536K

                                                                                                                                                                         1N4148
                                                                                                                                         1
                                                                                                                                                                                                                      TP2
                                                                                                       SENSE LOG                   R36                      R35                U4A
                                                                                                                                                  2                  2                                 D2                                             -15VA
                                                                                                                                  100K                                   -
                                                                                                        ADJUST                                              56K2     3
                                                                                                                                                                                     1
                                                                                                                                                                                                                            SENSE
                                                                    6         U2B                          (TRIMMER)                 3       CW                          +                                                  (SH4, D2)
                                                                        -                                                                                                      BA4560                 1N4148
                                                                                    7
                                                                    5
                                                                        +
                                                                              BA4560
                                                                                                                                    -15VA



                                                                                                                                                                                                                                COMPANY:
                                                                                                                                                                                                                                                         SYMETRIX INC.
A                                                                                                                                                                                                                                                   14926 35th Avenue West                                                                           A
                                                                                                                                                                                                                                                Lynnwood, WA 98037-2303 USA
                                                                                                                                                                                                                                TITLE:                                                                                                REV:
                                                                                                                                                                   DRAWN:                B
                                                                                                                                                                                          A
                                                                                                                                                                                                         DATED:
                                                                                                                                                                                                                                                      571 SCHEMATIC                                                                       A02
                                                                                                                                                                                           S                   2/2/96
                                                                                                                                                                                                                                DRAWING NO:
                                                                                                                                                                   RELEASED:                             DATED:
                                                                                                                                                                                                                                                          52 571- 1                                                 SHEET:       1 OF 6
                6                                                         5                                                          4                                                     3                                                            2                                                                1

                                                                                                                                                                 FORMAT
                               J3-2                                                          C19
                                                      R41                 R37                                                                                  PAGE/MUSIC
    MUSIC INPUT         +                                                                                                                                       (REAR PANEL)
                                                                                                                                                                  9      8
                                                      2K00                43K2               47pF                                                                                                                               MUSIC              PAGE OVER
                                                                     C21                                                                                                                                                        (SH3, B6)            MUSIC
D                                        R43
                                       100K0                         470pF
                                                                                             R39                                                                 7 SW3C
                                                                                                                                                                                                                                                       (FRONT PANEL)                                      6
                                                                                                                                                                                                                                                                                                              -
                                                                                                                                                                                                                                                                                                                   U6B
                                                                                                                                                                                                                                                                                                                         7
                                                                                                                                                                                                                                                                                                                                                       D
                               J3-3                                                          45K3                                                                                                                                                                                                         5
                                                                                                                                           R63                                                                                                                  2                                             +
                  GND                                                                6        U4B
                                                                                                                                           100K0                                                                                                            1            3
                                                                                                                                                                                                                                                                         CW
                                                                                                                                                                                                                                                                                                                   BA4560
                                                                                         -          7                                                                                                                                                            R78
                                                                                     5                                                                                                                                                                          50KB
                                         R44                         C22                 +
                                                                     470pF                    BA4560
                                       100K0
                              J3-1                                                                                                                                                                                                                           Q1
                                                      R42                 R38                                                                                                                                                                              2N5458
    MUSIC INPUT         -                                                                                                                                                                              C40          R81             R80




                                                                                                                                                                                                                                                       2




                                                                                                                                                                                                                                                                         1
                                                      2K00                43K2                                                                                                                      .039uF         536K            10K0
                                                                                     R40            C20
                                                                                     45K3           47pF                                 +15VA                                                                                                                                      R79
                                                                                                                                                         J6




                                                                                                                                                                                                                                                                 3
                                                                                                                                                                                                                                                                                    13K0
                                                                                                                                                    PHANTOM PWR
                                                                                                                     PHANTOM_PWR
                                                                                                                     (SH1, C5)                         1
                                                                   R153                                                                                     ENABLE
                                                                                                                     (SH1, D5)                         2
                                                               221 OHM                                                                                 3
                                                                                                                                                            DISABLE
C                                              C72           R53              R57            C31             C32
                                                                                                                                                                        NOTE:
                                                                                                                                                                        J6 disables phantom power for
                                                                                                                                                                                                                                                                                    C23
                                                                                                                                                                                                                                                                                    4.7NP
                                                                                                                                                                                                                                                                                                                                                       C
                                                                                                                                                                        all mics. Remove R153 to dis-
                                               47NP      100 OHM           100 OHM       330pF                                                                          able phantom power for page mic only.
                                                                                                             4.7NP
                                           R55                            C29
                                                                                                                                   PAGE MIC                                                                                                                                                        SIGNAL
                        J4                                                                                                                                                                                                                                                                         (SH3, D5)
                    XLR-FEMALE             1K00                           470pF
                                                                                             R59                                     TRIM
                                                                                                                                   (FRONT PANEL                                                                                                                                                                                       R77
                                   2                     C67                                                                       ADJ. TRIMMER)                        VOICE
     PAGE MIC                                                                                49K9                                                                                                                                                                                                                                    10K0
                    1                                                                                                     3   CW                                        (SH3, A6)                                                                                                                        D25
                                                                                                                                                                                                                                                                                            R158
       INPUT                       3
                                                                                     2        U5A
                                                                                                                   R60A        2
                                                        47NP                             -          1                                                                                                       C41                                                                                                                A2
                                                                                                                   10KB                                                                                                 R82
                        4                                                            3                                                                                                                                                                                                      10K0                               (SH4, C2)
                                           R56                            C30            +                                                                                                                                                                                                              1N4148                 (SH4, C4)
                                                                                              BA4560                      1
                                           1K00                           470pF                                                                                                                                         13K0
                                                                                                                                                                                                          4.7NP                                                                            INSTALL R158 & D25
                                               C73           R54                                                  R61                      R64                                                                                                                               R73           FOR OPTION T, ONLY
                                                                              R58
                                                                                                             301 OHM                       4K99                                                     REMOVE C41 AND/OR R82
                                                                                                                                                                                                      FOR OPTION T, ONLY                                                 499K0
                                               47NP     100 OHM            100 OHM
                                                                                                                                                                                                    C36                  D3
                                                                                      R62            C33                                                                                                                                                             6        U7B                  D4
                                                                                      49K9                                                                                                                                                                               -                                        R75
                                                                                                     330pF                                                                                                                                                                          7                                                         Q2
B                                                                                                                                                   C34
                                                                                                                                                                                                    47pF               1N4148                                        5
                                                                                                                                                                                                                                                                         +
                                                                                                                                                                                                                                                                              LF353N                              10K0
                                                                                                                                                                                                                                                                                                                                              2N4401   B
                                                                                                                                                                                                                                                                                               1N5245
                                                                                                                                                                                                    R68
                                                                                                                                                150pF
                                                                                                                                                                                                                                        C38                                                                           R76
                                                                                                                                                    R66                                             100K0                               .47uF                                                                        10K0
                            J3-5                                                         C24                                                                                                                          R70
                                                      R49                 R45                                                                       15K8
    PAGE LINE                                                                                                                                                                                                         100 OHM                    R71                 R72           R74
      INPUT         +                                                                                         C28              R65
                                                                                                                                            2        U6A          C35
                                                                                                                                                                                            2
                                                                                                                                                                                                -
                                                                                                                                                                                                      U7A
                                                                                                                                                                                                             1
                                                                                                                                                                                                                                                2M2                  100K0         2K00
                                                      2K00                43K2           47pF                                                   -          1                                3
                                         R51                         C26                                                      15K8          3                                                   +
                                                                                         R47                 4.7NP                              +                                                     LF353N
                                       100K0                         470pF                                                                                                                                                                                                                                                   -24VA
                                                                                                                                                     BA4560    .022uF
                                                                                                                                                           TP3                                                                                                                                                           (SH5, B3)
                            J3-6                                                         45K3                                                                       R67                R69
                                                                                                                                                                  100K0                                                                                         -15VA
                GND                                                                  6
                                                                                         -
                                                                                              U5B
                                                                                                    7
                                                                                                                                                                                       10K0

                                                                                     5
                                                                                         +                                                                                                 C37
                                         R52                         C27                      BA4560                                                                                       4.7NP                                  COMPANY:
                            J3-4
                                       100K0                         470pF
                                                                                                                                                                                                                                                                         SYMETRIX INC.
A   PAGE LINE
                    -
                                                      R50                 R46
                                                                                                                                                                                                                                                                        14926 35th Avenue West                                                         A
      INPUT                                           2K00                43K2                                                                                                                                                                                      Lynnwood, WA 98037-2303 USA
                                                                                     R48            C25                                                                                                                           TITLE:                                                                                                    REV:
                                                                                     45K3           47pF                                                                                                     DATED:
                                                                                                                                                                        DRAWN:       B
                                                                                                                                                                                      A                                                                                  571 SCHEMATIC                                                       A02
                                                                                                                                                                                       S                          2/2/96
                                                                                                                                                                                                                                  DRAWING NO:
                                                                                                                                                                        RELEASED:                            DATED:
                                                                                                                                                                                                                                                                 52 571- 1                                          SHEET: 2 OF 6
                6                                                             5                                                                4                                                                                3                                                               2                                           1
                                                                                                                                                                                  C44


                                                                                                                                                                                 82pF
                                                                                                                                                                                 R90A
                                                                                                                                                                            1             16
                                                                                                                                                                                 10K0
D                                                                    R86
                                                               61.9 OHM
                                                                                            +15VA                                C43                   R90B
                                                                                                                                                                        2         U10A                                              C46                                       J3-9
                                                                                                                                                                                                                                                                                                                                                                   D
                                                                                                                                                   2          15                                                   R91
                                                                                                                                                                             -            1
                                                                     R95
                                                                                                                             150pF                     10K0             3
                                                                                                                                                                             +
                                                                                                                                                                                                                                                                                     +     OUTPUT
                                                                                                                                                                                  BA4560                     100 OHM                47NP
                                                                                                                              R89                                 3
                                                        VC
                                            (SH4, B3)                1K37                                                                               R90C                                                                                                R93
                                                                                  3            7
                                                                                                                                 13K0                   10K0                                                                                                100K0
                                 +15VA                                        EC1            VCC                                                                                                                                                                          J3-10
                                                                                  U8
                                                                     1                              8                2            U9A                         14
                                                     SIGNAL
                                                (SH2, C1)
                                                                         IN     2150A         OUT
                                                                                                                     3
                                                                                                                             -          1                                                                                                                                            GND
                                                                              S V E G                     C42                +                                                    C45
                                   1                                          Y E C N                                             BA4560
                                                                              M E 2 D                     470pF
                                                                                                                                                                                                                                                            R94
                             R88                       R87                     4 5 2 6
                                            2                                                                                                                                                                                                               100K0
                                                                                                                                                                                 82pF
    THD TRIM                100K
                                                                                                                                                                                                                                    C47                                       J3-8
                                                       301K                                                                                                                      R90E                              R92
      (TRIMMER)                        CW                                                                                                                                12               5
                                 3                                                                                                U9B
                                                                     R83
                                                                     51.1
                                                                                                                     6
                                                                                                                         -              7                                                                                                                                            -     OUTPUT
                                                                                                                     5                                                            10K0                        100 OHM               47NP
                                                                                                                         +
                                                                                                                                  BA4560                                6         U10B
                                                                                                                                                                             -
C                                -15VA
                                                                                                                                               13
                                                                                                                                                       R90D
                                                                                                                                                              4         5
                                                                                                                                                                             +
                                                                                                                                                                                          7
                                                                                                                                                                                                                                                                                                                                                                   C
                                                                          R85                  R84                                                                                BA4560
                                                                         4K99                  61.9 OHM                                                10K0



                                                                                                                                                                                         SYMMETRY ADJ                                                   SOURCE LOG ADJ.
                                                                              -15VA                                                                                                                  (TRIMMER)                                                      (TRIMMER)
                                                                                                                                                                                                                           +15VA
                                                                                                                                                                                                         R98
                                                                 +15VA                                                                                                                                   100K                                                        -15VA                                                  R107
                                                                                                                                     



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