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555 simple and practical gust circuit

2015-01-27 18:55  
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555 simple and practical gust circuit
The circuit shown as the figure 12-8 consists of step-down rectifier and vibration control. The supply voltage VDD of IC (555) is about 10V. Because of the connection C, once getting power, 555 sets, SCR trigger is conducted, CZ has power, fan operates. When the threshold level of C is charged to be higher than 2/3, the 555 resets and fan stops. The stopping time of fan, that means t discharge = 0.693RP2C; fan operation time, t charge = 0.693 (R1 + RP1) C.