Touch fan speed control circuit eight stalls

  
Circuit shown in Figure 3-7. Just touch sensor chip (conductive sheet). Eight gear speed can be realized. CC4011 timing pulse oscillator consists of an integrated circuit Ai NA

ND gate 1,2 composition. When touching conductive sheet M while, Ai Kai vibration that is to CC4017 ~ - into the counting/pulse divider Az issued counting pulse, the output of Yl A2 of ~ Y9 turn out high through different resistor values R ~ ~ Ria buck to the optocoupler B, and then control the TRIAC V conduction angle, to achieve eight gear speed. Resistors R6 level 62kC1, R7 ~ R1a required to determine the actual debugging, so that two adjacent block electrical pressure (voltage across the motor) the order of 25 ~ 30V.




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