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Timing flashing circuit using FET drive

2017-02-01 15:42  
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Timing flashing circuit using FET drive
The circuit is as shown, it can form a timing control circuit of cycle light which only needs a few components. This circuit is composed of MOS time base circuit 7555, CMOS decimal counter (pulse distributor) 4017 and last stage VMOS power transistor. The power transistor can control the bulb with 2A maximum current. Resistance Rv between bulb and power supply +UB is used to limit connection current. The frequency of time base circuit is adjusted by potentiometer RP(it is about 0.5~10Hz). Nine-stage circulation register passes clock input terminal then controlled by square wave output singal, to change each output terminal into high level. Because pin 11 is connected to reduction input terminal pin 15, so the coming tenth pulse will control the first light to turn on.