Simple Phone Tap
Please note: I have received several emails saying that this circuit will not work and that it may hold your line off hook and to me it looks like it will. Build at your own risk.
Schematic
Parts
R1__________470 Ohm 1/4 Watt Resistor
R2__________1K 1/4 Watt Resistor
R3__________100K 1/4 Watt Resistor
R4__________6K 1/4 Watt Resistor
C1,C2_______0.01 uF 100V Ceramic Capacitor
K1__________24VDC Reed Relay
MISC________Wire, Headphone Plugs, Phone Plug Or Alligator Clips
1. To use the circuit, simply connect it in series to the phone. Then plug in the recorder. It will start recording when the phone is picked up.