Telephone-tap

  

Posted on Aug 9, 2012    6710

Amplify or record a telephone call with the simple circuit shown. The 8-0 secondary winding of a miniature transistor output transformer is connected in series with either of the telephone lines.


Telephone-tap - schematic

The 1000-0 primary winding can feed either a cassette recorder or an audio amplifier.




Leave Comment

characters left:

New Circuits

.