Telephone Recorder

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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.

Schematic

Parts

Part	Total Qty.	Description	Substitutions
R1	1	270K 1/4 W Resistor
R2	1	1.5K 1/4 W Resistor
R3	1	68K 1/4 W Resistor
R4	1	33K 1/4 W Resistor
C1	1	0.22uF 150 Volt Capacitor
Q1, Q2	2	2N4954 NPN Transistor
D1	1	1N645 Diode
MISC	1	Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

Notes

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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Comments

Add A Comment

anonymous Telephone Recorder Thursday, September 24, 2009 10:13:23 AM

This Telephone Recorder is fucking rad!

anonymous Telephone Recorder Friday, October 31, 2008 12:39:15 AM

its a nice circuit idea. Simple one. Nothing new though.

Rao Waseem Telephone Recorder Thursday, May 08, 2008 3:40:12 AM

this is very useful project.i liked it very much if u can any comments u can mail me.

sagar Telephone Recorder Thursday, February 28, 2008 3:57:06 AM

if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

navaneeth Telephone Recorder Tuesday, February 19, 2008 6:40:26 AM

would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project. what is remote control jack stands here for?

antany Telephone Recorder Tuesday, January 22, 2008 12:13:53 PM

where should we connect the inputs (on which phone line)

hulu beliku Telephone Recorder Wednesday, January 16, 2008 6:08:39 AM

would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

sushanth Telephone Recorder Thursday, January 10, 2008 9:25:54 PM

please tell me the circuit analysis and about remote control jack

hossam about the Telephone Recorder circuit Tuesday, December 04, 2007 1:08:57 PM

i just need more information about this circuit because i have to design it ,,and i need to know what each part of this circuit do ? wait 4 ur reply ,,and i hoep it come soon

pallavi Telephone Conversation Recorder Wednesday, November 28, 2007 4:35:52 AM

if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project

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anonymous	Telephone Recorder	Thursday, September 24, 2009 10:13:23 AM
This Telephone Recorder is fucking rad!
anonymous	Telephone Recorder	Friday, October 31, 2008 12:39:15 AM
its a nice circuit idea. Simple one. Nothing new though.
Rao Waseem	Telephone Recorder	Thursday, May 08, 2008 3:40:12 AM
this is very useful project.i liked it very much if u can any comments u can mail me.
sagar	Telephone Recorder	Thursday, February 28, 2008 3:57:06 AM
if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project
navaneeth	Telephone Recorder	Tuesday, February 19, 2008 6:40:26 AM
would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project. what is remote control jack stands here for?
antany	Telephone Recorder	Tuesday, January 22, 2008 12:13:53 PM
where should we connect the inputs (on which phone line)
hulu beliku	Telephone Recorder	Wednesday, January 16, 2008 6:08:39 AM
would youmind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project
sushanth	Telephone Recorder	Thursday, January 10, 2008 9:25:54 PM
please tell me the circuit analysis and about remote control jack
hossam	about the Telephone Recorder circuit	Tuesday, December 04, 2007 1:08:57 PM
i just need more information about this circuit because i have to design it ,,and i need to know what each part of this circuit do ? wait 4 ur reply ,,and i hoep it come soon
pallavi	Telephone Conversation Recorder	Wednesday, November 28, 2007 4:35:52 AM
if u dont mind pls mail me the complete info,block diagram,circuit diagram&major advantages ,applications of this project which helps me in doing my mini project