Published:2011-8-30 2:07:00 Author:Christina | Keyword: Sound control, electric fan, speed governing, cricket voice, control circuit | From:SeekIC
As the figure shows, it is composed of the sound control sensor, the audio-frequency amplifier, the monostable trigger circuit, the pulse count/distribution circuit, the SCR speed control circuit, the cricket sound circuit and the AC step-down rectifier circuit. This circuit uses the triggering sound control mode, and it has the three-stage wind-speed control and stalled control functions, when the fan is blowing, there is the sound of cricket. It has strong anti-interference characteristic.
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