209 lines
9.0 KiB
Plaintext
209 lines
9.0 KiB
Plaintext
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Automatic Phone Recorder
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by
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Atomic Punk
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May 1, 1989
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This device will allow any standard cassette tape recorder the
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ability to automatically record phone conversations. The device
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will start the tape recorder when the phone handset is lifted and
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stop the recorder when the handset is returned to the cradle.
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The device is a DC switch that is normally on via the forward
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biasing of Q1 via R3. Q1 now clamps Q2 into a forward state by
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biasing its complement well into a saturated state via R4. The
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DC switch is turned off via a negative voltage above that of the
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Zener (D1). This voltage is usually about 48 volts and is the on
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hook value of the phone line. This negative voltage over rides
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the effect of R3 and keeps the circuit off. When the phone is
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off the hook, the 48 volts drops to 10 volts, which is below the
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[more]
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zener voltage of D1, and R3 now turns the circuit on. Audio
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signal is via attenuator resistor R1 and DC isolating capacitors
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C1 and C2.
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This device is really only a high impedance switch that isolates
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the recording controlled device from the phone line via some
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simple electronic circuitry. It requires no battery and obtains
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power for operating from the remote jack that in most recorders
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is a source of 6 volts. When the remote jack is grounded,
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recorder operation starts, and when the grounding condition is
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removed, recorder operation stops.
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Parts list: Here's all you need:
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Name Qty Description
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R4 1 220 ohm 1/4 watt resistor
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R3 1 39k ohm 1/4 watt resistor
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R1 & R2 2 100k ohm 1/4 watt resistor
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C1 & C2 2 0.01 mfd/ 50V disc cap.
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Q2 1 PN2222 NPN Silicon
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Q1 1 PN2907 NPN Silicon
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[more]
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Z1 1 15 volt Zener diode
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P1 1 Sub-mini plug 2.5mm dia.
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CL1 & CL2 2 Alligator clips
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P2 1 Mini-Plug 3.5mm dia.
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Enclosure 1 Suitable enclosure for device
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PB1 1 1.25x1.67 perfboard
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WR4 (18") #24 hook-up black wire
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WR3 (18") #24 hook-up red wire
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Casto Castolite or paraffin wax
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[more]
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Circuit Diagram
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Red wire
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----------|---------Z1--------|--------------------|--------|----------
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Green | | | |
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-----| | | | |
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| | R3 |-----R4---b-Q2 |---P1
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| | *No connection* | | | |To remote
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| | | c c |of
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| *|* | | | |recorder
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|--- | ------------------|-----b-Q1 | |
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| | e | |
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| | |------------|--------|
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| | C1
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[more]
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| |----------------------------3 3-----------------|
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| |---P2
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| C2 |To Aux
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|--------------R1-----------------3 3-----------------|on
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Recorder
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** Green and Red wires go to corresponding color of telephone wires.
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** Make sure to connect Q1 and Q2 properly -- follow label c,b,e
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with the wires facing toward you and flat side up.
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- c is the located on the upper right hand side
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- b is the next wire left of c
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- e is the next wire left of b
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Anyway that concludes this circuit. Now you'll be able to
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monitor your phone line, and hear what goes on while you not
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around.
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**** Coming soon ******
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How to safely build waterproof M-80s.
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(>
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(>
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(>
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Automatic Phone Recorder
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|
|||
|
|
by
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|||
|
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|
|||
|
|
Atomic Punk
|
|||
|
|
|
|||
|
|
May 1, 1989
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|
|
|
|||
|
|
This device will allow any standard cassette tape recorder the
|
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|
|
ability to automatically record phone conversations. The device
|
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|
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will start the tape recorder when the phone handset is lifted and
|
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|
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stop the recorder when the handset is returned to the cradle.
|
|||
|
|
|
|||
|
|
The device is a DC switch that is normally on via the forward
|
|||
|
|
biasing of Q1 via R3. Q1 now clamps Q2 into a forward state by
|
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|
|
biasing its complement well into a saturated state via R4. The
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|
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DC switch is turned off via a negative voltage above that of the
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|
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Zener (D1). This voltage is usually about 48 volts and is the on
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|
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hook value of the phone line. This negative voltage over rides
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|
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the effect of R3 and keeps the circuit off. When the phone is
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|
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off the hook, the 48 volts drops to 10 volts, which is below the
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[more]
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|
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|
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zener voltage of D1, and R3 now turns the circuit on. Audio
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signal is via attenuator resistor R1 and DC isolating capacitors
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C1 and C2.
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|
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|
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This device is really only a high impedance switch that isolates
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|
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the recording controlled device from the phone line via some
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simple electronic circuitry. It requires no battery and obtains
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|
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power for operating from the remote jack that in most recorders
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is a source of 6 volts. When the remote jack is grounded,
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recorder operation starts, and when the grounding condition is
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|
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removed, recorder operation stops.
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|
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|
|||
|
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Parts list: Here's all you need:
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|
|
|
|||
|
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Name Qty Description
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R4 1 220 ohm 1/4 watt resistor
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R3 1 39k ohm 1/4 watt resistor
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R1 & R2 2 100k ohm 1/4 watt resistor
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C1 & C2 2 0.01 mfd/ 50V disc cap.
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|
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Q2 1 PN2222 NPN Silicon
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Q1 1 PN2907 NPN Silicon
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[more]
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|
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Z1 1 15 volt Zener diode
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P1 1 Sub-mini plug 2.5mm dia.
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CL1 & CL2 2 Alligator clips
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P2 1 Mini-Plug 3.5mm dia.
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Enclosure 1 Suitable enclosure for device
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PB1 1 1.25x1.67 perfboard
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|||
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WR4 (18") #24 hook-up black wire
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WR3 (18") #24 hook-up red wire
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Casto Castolite or paraffin wax
|
|||
|
|
|
|||
|
|
[more]
|
|||
|
|
|
|||
|
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Circuit Diagram
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|||
|
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|
|||
|
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Red wire
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|||
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----------|---------Z1--------|--------------------|--------|----------
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| | | |
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Green | | | |
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-----| | | | |
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| | | | |
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| | | e |
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| | R3 |-----R4---b-Q2 |---P1
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| | *No connection* | | | |To remote
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|||
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|
| | | c c |of
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|||
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| *|* | | | |recorder
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|||
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|--- | ------------------|-----b-Q1 | |
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|||
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| | e | |
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| | |------------|--------|
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| | C1
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[more]
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|||
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|||
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| |----------------------------3 3-----------------|
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| |---P2
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| C2 |To Aux
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|--------------R1-----------------3 3-----------------|on
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Recorder
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|||
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|||
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** Green and Red wires go to corresponding color of telephone wires.
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|||
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** Make sure to connect Q1 and Q2 properly -- follow label c,b,e
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|||
|
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with the wires facing toward you and flat side up.
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|||
|
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- c is the located on the upper right hand side
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|||
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- b is the next wire left of c
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|||
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- e is the next wire left of b
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|||
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|||
|
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Anyway that concludes this circuit. Now you'll be able to
|
|||
|
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monitor your phone line, and hear what goes on while you not
|
|||
|
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around.
|
|||
|
|
|
|||
|
|
**** Coming soon ******
|
|||
|
|
How to safely build waterproof M-80s.
|