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Analog control circuit for fans

Published on Apr 26 2011 // Fan control circuits

 Analog control circuit for fans

Circuit as shown. It consists of variable frequency multivibrator, relay control circuit, analog sound wave rectifier circuit and the AC step-down circuit. The general configuration of the fan control circuit, not only can the fan air flow while large, while small, has the characteristics of natural wind, but also accompanied by a realistic sound of the waves, while enjoying the cool breeze blowing, with a large natural feel. VT1, VT2, and C1, C2, R1 ~ R3, RP1 and so form a multivibrator. Since the oscillator circuit is not completely symmetrical, easy to start-up circuit. RP1 can be adjusted to change its resonant frequency, the oscillation frequency is:

Analog control circuit for fans 1