The 555 analog natural wind circuit(1)

Published:2011/5/30 21:26:00 Author:Borg | Keyword: natural wind | From:SeekIC

See as Figure 12-5, the analog natural circuit includes a step-down rectifier circuit, multi-resonate oscillating circuit and control circuit. The oscillating period and the duty cycle of the pulse square wave can be changed by adjusting RP1 and RP2. As D1 and D2 are linked in the charging and discharging circuits respectively, the charging time and discharging time can be adjusted separately. At the beginning of power-on, since the voltage on C2 can not mutate, the 2-pin of 555 is like a grounded connection LEV, and 3-pin is in a high LEV, the relay is still, the normally closed contact makes the fan get power,rotate and launch winds.



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