Electric light touch switch circuit

Published:2011/6/8 3:37:00 Author:Christina | Keyword: Electric light, touch, switch circuit | From:SeekIC

The circuit principle is as shown, the photoelectric coupler is composed of the neon tubes N1 and N2, the photoresistor RG1. When the hand touches the sheetmetal S1, the N1 turns on and the resistance of RG1 becomes small, so the two-way thyristor VS1 conducts because it gets enough trigger current, so the bulb H gets power to light. At the same time, the 220V AC voltage of H makes the N2 to light, this light is shining on the RG1, so at this time, even you stop touching, VS1 remains in the conduction state, and the H still lights. In the figure, the photoelectric coupler is composed of the neon tube N3 and the photoresistor RG2.



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