Touch socket circuit

Published:2011/6/8 6:57:00 Author:Christina | Keyword: Touch, socket | From:SeekIC

The circuit is as shown in the figure, when your finger touches the sheetmetal S, the neon tube N lights, the photoelectric coupler which is composed of the N and the photoconductive resistance RG to decrease the resistance of RG, the two-way thyristor VS gets enough trigger current to conduct, so the load of the socket CZ gets power to work. At the same time, the 220V AC voltage of CZ is reduced by the capacitance C2, then is rectified by the diodes VD1 and VD2, and this AC voltage is also regulated by the regulator tube VDW and filtered by the capacitance C1, at last it changes into the DC voltage and adds to the VS's control port through the resistance R2, so even the finger has left, VS is still in the conduction state to keep the load working normal.



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