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  1. OptoPcScc current loop 1200 baud modem        Revised:  900324
  2. 890517                                        Revision: 3
  3.  
  4. Bill of materials OptoPcScc currentloop 1200 baud packet modem 
  5.  
  6.  Item  Quantity  Reference                 Part
  7. _______________________________________________________
  8.  
  9.     1       1    U1                        TCM3105N
  10.  
  11.     2       1    U2                        74HCT132
  12.  
  13.     3       1    U3                        78L05
  14.  
  15.     4       2    Q1,Q2                     BC559
  16.  
  17.     5       1    Q3                        BS170
  18.  
  19.     6       4    D3,D1,D2,D4               1N4148
  20.  
  21.     7       1    D5                        47V  Zener
  22.  
  23.     8       1    X1                        4.43MHz  Xtal
  24.  
  25.     9       1    P1                        FEMALE DB9
  26.  
  27.    10       1    P2                        5P DIN 180
  28.  
  29.    11       2    J1,J2                     JUMPER
  30.  
  31.    12       1    R1                        100        Remove this resistor if
  32.                                                       the audio source isn't an
  33.                                                       unloaded power amplifier. 
  34.  
  35.    13       2    R9,R10                    470
  36.  
  37.    14       1    R2                        1K
  38.  
  39.    15       2    R3,R8                     4K7
  40.  
  41.    16       1    R5                        10K
  42.  
  43.    17       1    R6                        100K
  44.  
  45.    18       1    R7                        3M3
  46.  
  47.    19       1    R4                        Optional for transmiter
  48.                                            whithout PTT input.
  49.  
  50.    20       1    Z1                        1K
  51.  
  52.    21       1    Z2                        100K
  53.  
  54.    22       1    C9                        10n
  55.  
  56.    23       2    C4,C3                     22n
  57.  
  58.    24       1    C1                        47n
  59.  
  60.    25       2    C8,C7                     0.1u
  61.  
  62.    26       1    C2                        0.22u 
  63.  
  64.    27       2    C6,C5                     10u
  65.  
  66.