Timing Flash Circuit Driven By FET

Published:2011/5/12 23:44:00 Author:Robert | Keyword: Timing, Flash, FET | From:SeekIC

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.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/LED_and_Light_Circuit/Timing_Flash_Circuit_Driven_By_FET.html

Print this Page | Comments | Reading(3)