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Telephone tap monitor conversation circuit

2015-01-21 17:28  
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Telephone tapping is the monitoring of telephone and Internet conversations by a third party, often by covert means. The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on the telephone line.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.The 1000-0 primary winding can feed either a cassette recorder or an audio amplifier.The task of an audio amplifier is to take a small signal and make it bigger without making any other changes in it. This is a demanding task, because a musical sound usually contains several frequencies, all of which must be amplified by the same factor to avoid changing the waveform and hence the quality of the sound.
 

Telephone-tap