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  1.                     Automatic Phone Recorder
  2.  
  3.                              by
  4.  
  5.                            Atomic Punk
  6.  
  7.                            May 1, 1989
  8.  
  9. This device will allow any standard cassette tape recorder the
  10. ability to automatically record phone conversations.  The device
  11. will start the tape recorder when the phone handset is lifted and
  12. stop the recorder when the handset is returned to the cradle.
  13.  
  14. The device is a DC switch that is normally on via the forward
  15. biasing of Q1 via R3.  Q1 now clamps Q2 into a forward state by
  16. biasing its complement well into a saturated state via R4.  The
  17. DC switch is turned off via a negative voltage above that of the
  18. Zener (D1).  This voltage is usually about 48 volts and is the on
  19. hook value of the phone line.  This negative voltage over rides
  20. the effect of R3 and keeps the circuit off.  When the phone is
  21. off the hook, the 48 volts drops to 10 volts, which is below the
  22. [more]       zener voltage of D1, and R3 now turns the circuit on.  Audio
  23. signal is via attenuator resistor R1 and DC isolating capacitors
  24. C1 and C2.
  25.  
  26. This device is really only a high impedance switch that isolates
  27. the recording controlled device from the phone line via some
  28. simple electronic circuitry.  It requires no battery and obtains
  29. power for operating from the remote jack that in most recorders
  30. is a source of 6 volts.  When the remote jack is grounded,
  31. recorder operation starts, and when the grounding condition is
  32. removed, recorder operation stops.
  33.  
  34. Parts list:  Here's all you need:
  35.  
  36. Name                Qty                 Description
  37. R4                   1                  220 ohm 1/4 watt resistor
  38. R3                   1                  39k ohm 1/4 watt resistor
  39. R1 & R2              2                  100k ohm 1/4 watt resistor
  40. C1 & C2              2                  0.01 mfd/ 50V disc cap.
  41. Q2                   1                  PN2222 NPN Silicon
  42. Q1                   1                  PN2907 NPN Silicon
  43. [more]       Z1                   1                  15 volt Zener diode
  44. P1                   1                  Sub-mini plug 2.5mm dia.
  45. CL1 & CL2            2                  Alligator clips
  46. P2                   1                  Mini-Plug 3.5mm dia.
  47. Enclosure            1                  Suitable enclosure for device
  48. PB1                  1                  1.25x1.67 perfboard
  49. WR4                  (18")              #24 hook-up black wire
  50. WR3                  (18")              #24 hook-up red wire
  51. Casto                                   Castolite or paraffin wax
  52.  
  53. [more]       Circuit Diagram
  54.  
  55.  
  56. Red wire
  57. ----------|---------Z1--------|--------------------|--------|----------
  58.           |                   |                    |        |         
  59. Green     |                   |                    |        |         
  60. -----|    |                   |                    |        |
  61.      |    |                   |                    |        |
  62.      |    |                   |                    e        |    
  63.      |    |                   |                    |        |
  64.      |    |                   R3      |-----R4---b-Q2       |---P1
  65.      |    | *No connection*   |       |            |        |To remote
  66.      |    |                   |       c            c        |of 
  67.      |   *|*                  |       |            |        |recorder
  68.      |--- | ------------------|-----b-Q1           |        |
  69.      |    |                           |            |        |
  70.      |    |                           e            |        |
  71.      |    |                           |------------|--------|
  72.      |    |                             
  73.      |    |                             C1
  74. [more]            |    |----------------------------│ │-----------------|
  75.      |                                                     |
  76.      |                                                     |---P2
  77.      |                                  C2                 |To Aux
  78.      |--------------R1-----------------│ │-----------------|on
  79.                                       &                       Recorder
  80.  
  81. ** Green and Red wires go to corresponding color of telephone wires.
  82. ** Make sure to connect Q1 and Q2 properly -- follow label c,b,e
  83.    with the wires facing toward you and flat side up.
  84.       - c is the located on the upper right hand side
  85.       - b is the next wire left of c
  86.       - e is the next wire left of b
  87.  
  88. Anyway that concludes this circuit.  Now you'll be able to
  89. monitor your phone line, and hear what goes on while you not
  90. around.
  91.  
  92.