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Telephone Recorder

2016-02-02 10:23  
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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.



This is the schematic of the Telephone Recorder



Total Qty.
R11270K 1/4 W Resistor 
R211.5K 1/4 W Resistor 
R3168K 1/4 W Resistor 
R4133K 1/4 W Resistor 
C110.22uF 150 Volt Capacitor 
Q1, Q222N4954 NPN Transistor 
D111N645 Diode 
MISC1Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug 



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

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