Fans can light three-gear speed control circuit

Posted on Mar 28, 2007

Circuit shown in Figure 3-5. It can be manual (button SB) and light control (phototransistor VTj). When the light of a flashlight quasi VTi, fans will turn on the operation, an

Fans can light three-gear speed control circuit
Click here to download the full size of the above Circuit.

d sub slow, medium, fast three times a block is automatically adjusted. A CMOS hex inverter Icl (door F2-F4) and resistance, capacitance circuit clock pulse generator. By an integrated circuit Icz decimal counting/timing decoder transistor VTz ~ VT4, TRIAC Vl-V3 wind speed fan and other components (gear) switch circuit.

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