August 02, 2009

call recorder

Introduction:-
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.

Diagram:-

This is the schematic of the Telephone Recorder

click on the image for better quality..................

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.

2 comments:

Nice project........i will try it.

ya just try to do all the project's in this site and try to simulate using PROTEUS SOFTWARE.....

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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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