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Timing Flash Circuit Driven By FET

2017-02-01 11:10  
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Timing Flash Circuit Driven By FET
Using the circuit in the picture, it only needs a few components to make up a loop light timing control circuit. The circuit is made up by MOS time-base circuit 7555, CMOS decimal counter (pulse divider) 4017 and end-stage VMOS power transistor. The power transistor can control the lamp whose maximum current is 2A, and the resistance RV between lamp and power +VB is used for limiting current. The time-base circuit's frequency is adjusted by the potentiometer RP (about 0.5~10Hz). The 9-stage loop register is controlled by the square wave output signal from the timing input port to change each output port to be high-voltage level in turn. Because the pin 11 is connected with the reset input pin 15, the coming of the tenth pulse would control the first lamp bright again.