Keeping Recording Continuous Sound Control Circuit

Published:2011/8/5 19:01:00 Author:Robert | Keyword: Keeping, Recording, Continuous, Sound Control | From:SeekIC

The picture shows the keeping recording continuous sound control circuit. This circuit's key point is the monostable delay circuit which is made up by 555 and R2, C3. The sound recording signal is added on the A port for input. When the A port has no sound recording signal input, the transistor BG1 would be not conducted to make the 555's pin 6 be high voltage level. So the 555 resets and output low voltage level on pin 3. And the BG2 is correspondingly not conducted and the motor is not working for recording. When the A port has sound recoding signal input, the D1, D2, C2 are processing for voltage doubler rectifier. And the BG1 is correspondingly saturated and conducted. The pin 2 would be in low voltage level (<1/3VDD) to make the 555 set. The pin 3 would output high voltage level so that the BG2 is also saturated and conducted. The motor D is electrified and then it is working for recording.



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