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Real-time Telephone Automatic Recording Device Circuit Diagr

2014-11-05 06:28  
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Real-time Telephone Automatic Recording Device Circuit Diagram
Real-time telephone automatic recording device circuit is shown in the above picture. Despite automatic recording for the making calls and answering calls, the recording device can also automatically input the time of recording before recording the message , which makes the recording material more detailed and accurate and thus easy to be picked out and analysis. IC1 and IC2 in the picture are time-base integrated circuit NE555. The voice timing system uses UT-6657 type made-up timing table. Relay J1 and J2 are HG4098. The coupling device is 4N15, and the diodes are IN4007.