Telephone Recorder


Author Views Views Today Rank Comments
47,218 60 49
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

Part
Total Qty.
Description
Substitutions
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

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.

Related Circuits

Ringing Phone Light Flasher, Phone Busy Indicator, FM Telephone Bug, Cut Phone Line Detector, Simple Phone Tap, Telephone Hold Button, Telephone Recorder, Remote Telephone Ringer

Comments

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
hashim mahmoud
Telephone Recorder
Wednesday, November 21, 2007 3:07:16 PM
hi can u help me to do this project.by sending it's complete info. & circuit analysis & its major advantages to my mail id. thanks.
Rajkumar
Telephone Recorder
Thursday, November 01, 2007 4:06:51 AM
Hi, Iam rajkumar from chennai, India.I am ruing a concern in chennai.so I feel like some problem was going on with our workers pl. send the details of thie phone recorder to record the conversation between the workers nd the clients
The last 10 comments are currently shown. Show All Comments.

If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.

Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.

All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.

Name:
Email:
Subject:
Comments:
Anti Spam Code:
Please enter the exact text shown in the image above into the box below.
Browser cookies must be enabled to comment on circuits.

Privacy Policy

Back To Circuits Page | Mail Me | Search