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555 imitating natural wind circuit 2

2015-01-28 12:29  
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555 imitating natural wind circuit 2
As shown in Figure 12-6, the circuit includes the capacitor step-down rectifier circuit and multivibrator circuit and relay control section. 555 and R1, RP1, RP2, R2, C3 and other components form an astable multivibrator. The natural wind of fan is based on the low oscillator output, the relay J pullling could make the motor M operate, while the output is high, J releases, the motor M stops. That is the motor turns on and off intermittent, and the feeling is like gust, natural wind. Proper selection of charging time and discharging time of capacitor C3 can achieve realistic results.