Simple Telephone Line Tap Circuit

Circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line.

R1    1    470 Ohm 1/4 Watt Resistor   
R2    1    1K 1/4 Watt Resistor   
R3    1    100K 1/4 Watt Resistor   
R4    1    6K 1/4 Watt Resistor   
C1, C2    2    0.01 uF 100V Ceramic Capacitor   
K1    1    24VDC Reed Relay   
MISC    1    Wire, Headphone Plugs, Phone Plug Or Alligator Clips

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.
The values of R1 and R2 may have to be adjusted, depending on the characteristics of the phone line it is connected to (they vary). If the R1+R2 combination is increased sufficiently (try 2.47K) then the circuit can be connected in parallel with the line, thus covering all attached devices