Telephone Recorder

This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder's microphone input, and the recorder's remote control jack. It senses the voltage in the phone line and begins recording when the line drops to 5 volts or less.

Schematic

This is the schematic of the Telephone Recorder

Parts

R1__________270K 1/4 W Resistor
R2__________1.5K 1/4 W Resistor
R3__________68K 1/4 W Resistor
R4__________33K 1/4 W Resistor
C1__________0.22uf 150 Volt Capacitor
Q1,Q2_______2N4954 NPN Transistor
D1__________1N645 Diode
MISC________Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

Notes

1. The circuit can be placed anywhere on the phone line, even inside a phone.

2. Some countries or states require you to notify anyone you are talking to that the conversation is being recorded. Most recoders do this with a beep-beep. Also, you may have to get permission from the phone company before you connect anything to their lines.