The circuit consists of a 555 time base circuit, a non-contact switch circuit, a dog bar analog circuit and a power circuit. When no one touches the metal mesh cover of the fan, the output of pin 3 of the 555 time base circuit is low level, and the transistor BG1 is turned on, and the bidirectional thyristor CT is controlled to be turned on, so that current flows through the fan motor to rotate the motor DJ. The speed of rotation depends on the voltage across the DJ. The voltage across the DJ is controlled by the two-way thyristor conduction angle. Adjusting the potentiometer W, you can change the size of the conduction angle, so as to change the size of the fan air volume. Once someone touches the fan metal cover TP, the fifth pin of the 555 outputs a high level. On the one hand, the transistor BG1 is cut off, forcing the two-way controllable. The silicon CT is cut off, so that the fan stops; on the other hand, the BG2 is turned on, so that the dog barking language integrated circuit NS5608 starts working, and the BG3 is amplified, and the speaker Y is pushed to make a barking sound.
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In this circuit, when the hand touches the net cover, the electric fan immediately loses power. When the hand leaves the metal mesh cover for a few seconds, the fan is automatically turned back on. When the first hand touches the metal mesh cover, the fan's control box will also give a warning to stop touching.
The picture shows the electric fan finger touch protection alarm circuit diagram:
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