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Telephone Automatic Recording Control Device Circuit Diagram

2014-11-12 05:19  
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Telephone Automatic Recording Control Device Circuit Diagram
The telephone automatic recording control device circuit is shown in the above picture. When there is ringing signal in the line (90V, 15Hz) or the telephone is off-hook, the delayed pin 3 of NE555 shows high potential, which makes J conducted. The AC power supply of the recorder is conducted by the contact and automatically records the message. It stops recording when the telephone is off-hook or the power supply is cut. K is the manual-operational switch, and is used to control the power supply during sound reproduction.