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Dual Headphone Amplifier Type G217

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					                                                                P.O.Box 3073
                                                                  Pinegowrie
                                                                        2123
                                                                     Gauteng
                                                                 South Africa

                                                          Tel: +27 11 838 0620
                                                         Fax: +27 11 838 0625
                                                  e-mail: soundf@global.co.za
                                                      www.soundfusion.co.za
Soundfusion (Pty) Ltd.
Co. Reg. No. 19940095870




                               TECHNICAL MANUAL

                           DUAL HEADPHONE AMPLIFIER

                                  TYPE G217
                  Dual Headphone Amplifier Type G217




GENERAL DESCRIPTION

The unit is a Stand-Alone PCB, designed to take either two independent stereo
balanced line inputs to drive two independent headphone outputs, or – via internal
jumpers – to feed one stereo balanced input to both headphone outputs. The non used
line input then acts as a loop thru to chain multiple units if required

The High Impedance Input is buffered through to the Low Impedance Buffered Output,
which prevents the input source from being loaded when a headphone is plugged in.

The gain for each channel is set individually by an external dual log pot.

The Audio Inputs are on 3pin Wieland connectors. The Headphone Outputs appear on
a Stereo Headphone Jack mounted on the PCB.

The unit has an internal +/-15VDC power supply, which is protected via fuses F1 & F2
Dual Headphone Amplifier Type G217




    DUAL HEADPHONE AMPLIFIER

                 TYPE G217

          COMPONENT LAYOUT
                         Dual Headphone Amplifier Type G217




                                                                                                   +

                                                                                               LED1
                                                                                               Bottom




                        P2                                                                                        P1




                                                                                                                  R30
                                                                SK2                                                                               SK1
                                                                                                                  R29
                                              C18               C17                                                                  C22          C21



                  R11                                                                              R14           R25                                               R28

                  C5                                                                             C7              C13                                              C15
                                                     U1                                                                                    U3
                  R9                                                                             R12             R23                                               R26
                  R10                                                                            R13             R24                                               R27

                  C6 +                        C20               C19                        +     C8              C19 +               C24          C23        +    C20



                  R4                                                                               R8            R18                                               R22

                  R1                                                                               R5            R15                                               R19
                                                     U2                                                                                    U4
                  R2                                                                               R6            R16                                               R20

                  R3                                                                               R7            R17                                               R21



                                                                                                       J1
                                                                                                       J2
                                                                                                       J3
                         C1              C2                     C3                    C4               J4               C9         C10            C11      C12




                                                                                                                                                                 + C25
                                                                                                                  BR1




                                                                                                                                                                 + C26
                                                                                                                         U6   U5
                                               TR1                                                          D1                             D2



                                                                                                                                                                 + C27
                                                                                                                                           C29
                                                                                                                                           C30

                                                                                                                                                                 + C28
                                                                                                    CH2/ LOOP                               CH1
CON5                                                                                  CON1                   CON2              CON3                 CON4


                  ! 220VAC !             F2          F1




TITLE                                                     REVISIONS
                                                                                                                                                                         P.O.Box 3073
         DUAL HEADPHONE AMPLIFIER                         NO.    DATE   DESCRIPTION                                                                                        Pinegowrie
                                                                                                                                                                                 2123
                        TYPE G217                                                                                                                                             Gauteng
                                                                                                                                                                          South Africa
DATE ORIGINAL                  SCALE
                                                                                                                                                                   Tel: +27 11 838 0620
                                                                                                                                                                  Fax: +27 11 838 0625
                                                                                                                                                            e-mail: soundf@global.co.za
LATEST REVISION                JOB NO.                    CHECKED                          DRAWN
                                                                                                                                                             www.soundfusion.co.za
   14 August 2006                                                                              Ferdi Brendgen
Dual Headphone Amplifier Type G217




    DUAL HEADPHONE AMPLIFIER

                 TYPE G217

                 PARTSLIST
                   Dual Headphone Amplifier Type G217



PARTS LIST

Dual Headphone Driver Card G217

Reference                     Value       Description

  R          1-8               10k        1 % 1/4W Metal Film

  R           9                33k        1 % 1/4W Metal Film

  R           10               10k        1 % 1/4W Metal Film

  R           11              10R         1 % 1/4W Metal Film

  R           12               33k        1 % 1/4W Metal Film

  R           13               10K        1 % 1/4W Metal Film

  R           14               10R        1 % 1/4W Metal Film

  R         15 - 22            10k        1 % 1/4W Metal Film

  R           23               33k        1 % 1/4W Metal Film

  R           24               10k        1 % 1/4W Metal Film

  R           25              10R         1 % 1/4W Metal Film

  R           26               33k        1 % 1/4W Metal Film

  R           27               10k        1 % 1/4W Metal Film

  R           28              10R         1 % 1/4W Metal Film



  C          1-4               10uF       25V Electrolytic non polarized Radial

  C          5, 7              10pF       63V Ceramic 5mm spacing l
 C      6, 8         10uF       16V Tantalum 5mm spacing

 C     9 - 12        10uF       25V Electrolytic non polarized Radial

 C     13, 15        10pF       63V Ceramic 5mm spacing

 C     14, 16        10uF       16V Tantalum 5mm spacing

 C     17 - 24      0.luF       63V Ceramic 5mm spacing
 C     25 - 28     2200uF       35V Electrolytic 5mm spacing radial

 C     29, 30       0.1uF       63V Ceramic 5mm spacing

 P      1-2          20k        ALPS Dual Log

 D       1,2       1N4007       Diode Silicon

 U      1-4        NE5532       Dual op-amp
 U       5          7815        15V Positive Voltage Regulator

 U       6          7915        15V Negative Voltage Regulator

CON     1-4         3-Pin       Wieland Screw Terminal

CON      5          2-Pin       Wieland Screw Terminal

 SK     1, 2        3-Pole      Headphone Socket BPO or 1/4 “

 TR      1       2 x 15V, 6VA   PCB Transformer

 BR      1           3A         Bridge Rectifier

 F      1,2        250mA        Fuse Wickmann TR5 Subminiature

 LED     1           Red        3mm

 J      1-4         2-Pin       PCB Jumpers
Dual Headphone Amplifier Type G217




    DUAL HEADPHONE AMPLIFIER

                 TYPE G217

            CIRCUIT DIAGRAM
                                          Dual Headphone Amplifier Type G217

                                                        R4

                                                       +V           C17
   CON 1                      C1     R1                         8
                                           2
    +2                                         -
                                                                                                                        +V C19
                                                                              1
                                                       U1A
                              C2     R2                                                                                      8
Ch2 -3                                     3                                                   P1
                                               +                                                                   3
 L
                                                                                                                                                1   R11
                                                                                                                        U1B
     1                                         R3
                                                                                                                   2


                                                                                                                        R9


                                                                                                                        C5
                                                                                                                  R10

                                                                                                              + C6

                                                                                                                                                                                                    SKT 2
                                                        R8



  CON 2                       C3     R5    6
    +2                                             -
                                                                          7
                                                       U2A
                              C4     R6
 Ch2 -3                                    5                                                   P1
                                                   +                                                               5
  R                                                          4      C18                                                                             R14
                                                                                                                                                7
                                                                                                                        U2B
     1                                         R7
                                                                                                                   6
                                                             -V
                                                                                                                                  4 C20
                                                                                                                                                                         D1
                                                                                                                        R12          -V                                                    F1     +V REG
                                                                                                                                                                         U5
                                                                                                                                                                                                     R29
                                                                                                                        C7                                CON5                                             5
                             J1-4
                                                                                                                  R13                                                  C25 C27           C29

                                                                                                              + C8                                                                           LED1
                                                                                                                                                                 BR1
                                                                                                                                                                                                         3
                                                                                                                                                                                                        0V
                                                       R18                                                                                                             C26    C28        C30

                                                       +V           C21                                                                                                                              R30
                                                                                                                                                                                           F2
  CON 3                       C9    R15                      8                                                                                                           U6
                                           2                                                                                                                                                            4
   +2                                          -                                                                                                                                                   -V REG
                                                                                                                       +V        C23
                                                                          1
                                                       U3A                                                                                                               D2
                             C10    R16                                                                                      8
Ch1                                        3                                                   P2                  5
    -3                                         +
 L
                                                                                                                                                1   R25
                                                                                                                        U3B
     1                                     R17
                                                                                                                   6


                                                                                                                       R23


                                                                                                                     C13
                                                                                                                  R24

                                                                                                              + C14

                                                                                                                                                                                            SKT 1
                                                       R22



  CON 4                      C11    R19
                                           6
   +2
                                                                          7
                                                       U4A
                             C12    R20
Ch1                                        5                                                   P2                  5
    -3
 R                                                          4       C22                                                                             R28
                                                                                                                                                7
                                                                                                                        U4B
    1                                      R21                                                                     6
                                                            -V
                                                                                                                                 4        C24
                                                                                                                       R26            -V


                                                                                                                     C15
                                                                                                                  R27

                                                                                                              +
                                                                                                                  C16


           TITLE                                                                   REVISIONS
                                                                                                                                                                                                P.O.Box 3073
                       DUAL HEADPHONE AMP                                         NO.   DATE    DESCRIPTION
                                                                                                                                                                                                   Pinegowrie
                                                                                                                                                                                                        2123
                                                                                                                                                                                                    Gauteng
                                    TYPE G217                                                                                                                                                   South Africa
           DATE ORIGINAL                   SCALE
                                                                                                                                                                                         Tel: +27 11 838 0620
                   24 August 1994                                                                                                                                                      Fax: +27 11 838 0625
                                                                                                                                                                                    e-
                                                                                                                                                                                    mail: soundf@global.co.za
           LATEST REVISION                 JOB NO.                                CHECKED                               DRAWN                                                       www.soundfusion.co.za
                11 August 2006                 G217-Diagram.vsd                                                                  Ferdi Brendgen
Dual Headphone Amplifier Type G217




     DUAL HEADPHONE AMPLIFIER

                  TYPE G217

           BACKPANEL LAYOUT
                                  Dual Headphone Amplifier Type G217



                                                        G217 DUAL HEADPHONE AMPLIFIER

                                                                           BACKPANEL LAYOUT
                                                                                                 +



                                                                                                                         CH2 IN/
                                                                                                                         LOOP                                CH1 IN

                       220
                        V
                                                                                                              1    2     3       1     2     3    1    2     3       1    2      3
                                                                                                                  LEFT               RIGHT            LEFT               RIGHT



                         R8                 R18
                                                               JUMPERS FITTED
                         R5                 R15
                                                               CH1 Left In: To H/P1 Out Left
                         R6                 R16                                H/P2 Out Left
                                                                                                              Gnd Hot    Cold Gnd Hot        Cold Gnd Hot    Cold Gnd Hot        Cold
                         R7                 R17
                                                               CH1 Right In: To H/P1 Out Right
                                                                                H/P2 Out Right
                             J1                                CH2 Left: Loop From CH1 Left
                             J2
                                                               CH2 Right: Loop From CH2 Right
                             J3
                  C4         J4                   C9




                                                                                                  +



                                                                                                                             CH2 IN/
                                                                                                                              LOOP                           CH1 IN

                       220
                        V
                                                                                                              1    2     3       1     2     3    1    2     3       1     2     3
                                                                                                                  LEFT               RIGHT            LEFT               RIGHT



                         R8                 R18
                                                                   NO JUMPERS FITTED
                         R5                 R15
                                                                   CH1 Left In: To H/P1 Out Left
                         R6                 R16                    CH1 Right In: To H/P1 Out Right
                                                                                                              Gnd Hot    Cold Gnd Hot        Cold Gnd Hot        Cold Gnd Hot        Cold
                         R7                 R17
                                                                   CH2 Left In: To H/P2 Out Left
                                                                   CH2 Right In: To H/P2 Out Right
                             J1
                             J2
                             J3
                  C4         J4                   C9




TITLE                                                     REVISIONS
          DUAL HEADPHONE AMP                             NO.   DATE   DESCRIPTION
                                                                                                                                                                                        P.O.Box 3073
                                                                                                                                                                                           Pinegowrie
                TYPE G217                                                                                                                                                                       2123
                                                                                                                                                                                            Gauteng
            BACKPANEL LAYOUT                                                                                                                                                            South Africa
DATE ORIGINAL                     SCALE
                                                                                                                                                                                Tel: +27 11 838 0620
        24 August 1994                                                                                                                                                        Fax: +27 11 838 0625
                                                                                                                                                                           e-
                                                                                                                                                                           mail: soundf@global.co.za
LATEST REVISION                   JOB NO.                CHECKED                     DRAWN                                                                                 www.soundfusion.co.za
     12 August 2006                G217-Backpanel.vsd                                        Ferdi Brendgen

				
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