Timed trigger switch circuit

Published:2011/7/1 5:51:00 Author:Fiona | Keyword: timed, trigger switch | From:SeekIC

The AC power source reduces the voltage by the capacitance C1,bridge rectifies by diode vDl—vD4,filters by the capacitor C2 and obtains the 12V DC voltage in both ends of the diode VD5.After rectifying and current-limiting by the diode vD6 and resistor R2,the supply voltage charges the capacitor c4 by potentiometer RP, and resistors R3, R4.When the voltage of the A's ② ⑥ pins is greater than 2 / 3 supply voltage because of c4 both ends voltage being charged to time base integrated circuit, A is in reset state, its ③ pin is low,the relay KM is closed to make the moving contacts are launched to control the trigger circuit or lanterns.



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