Published:2011/8/9 18:35:00 Author:Vicky | Keyword: Telephone, Automatic Recording Control Device | From:SeekIC
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.
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