The simple 2-terminal source free electric energy saving switch circuit

Published:2011/7/2 3:40:00 Author:Borg | Keyword: 2-terminal, source free, energy saving switch | From:SeekIC

By pressing S, the 220V AC current is charging C through V5 after it is rectified, when the voltage on the capacitor is higher than the trigger voltage of the single way SCR control pole, the SCR is triggered and conducting, and the bulb is lighting. After S is released, the electricity of the capacitor is discharging through resistor R, which keeps the single-way SCR conducting, when the time reaches the set time (the lighting time of this circuit parameter is from 1 to 2min), the single-way SCR is cut off when the current is lower than the maintaining current, the bulb is cut off.



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