The DC low-voltage switch circuit designed with NE555

Published:2011/6/5 21:19:00 Author:Seven | Keyword: low-voltage switch circuit | From:SeekIC

VD1－VD4,R1,C1 and C2 of the switch form a rectifier filter circuit. NE555,R2,R3,C4,VD6 and so on form a multi-resonate oscillating circuit, whose frequency is about 20KHz. R4, C3 and VD5 form a step-down steady circuit, which provide the NE555 with a working voltage of 12V. The high power pipe VT1 and the transformer T consist a switch circuit. The working condition of VT1 is controlled by 3-pin of NE555, the conducting time depends on the width of pulses, the pulse width is adjusted by R3. If the pulse width becomes wider, the output voltage is getting higher, and vice versa.



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