The 555 analog natural wind circuit(3)

Published:2011/5/30 21:38:00 Author:Borg | Keyword: natural wind | From:SeekIC

See as Figure 12-7, the circuit includes a capacitor step-down rectifier circuit, 555 multi-resonate oscillator and controllable silicon control circuit.The rectifier circuit generates a LEV of +7V as the power supply of 555. IC, R2,R3 and C4 consist a non-steady multi-resonate oscillator, whose frequency is T=0.693(R2+2R3)C4, of whichT(light)=0.693(R2+R3)C4T(discharging)=0.693R3C4The duty cycle is close to 50%. The period of the figure parameter is about 26S, i.e after the fan motor runs for about 14s, it stops and keeps still for 12s, the effect is the natural wind. Figure 12-7 the analog natural wind circuit(3)



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