LIGHT_OPERATED_TURNOFF_TOUCH_SWITCH

Published:2009/7/14 20:00:00 Author:May | From:SeekIC

When R5 is illuminated by a flashlight, its resistance lowers, leaving only 10,000Ω as the minimum base resistance. That process gives a positive potential to the base of Q1, therefore turning on the transistor, activating RY2, and turning off the SCR. Or you can press S1 to turn the circuitry off.



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