Novel touch switch table lamp circuit

Published:2011/5/5 7:35:00 Author:Nicole | Keyword: touch switch, table lamp | From:SeekIC

The circuit is as shown, it is divided into four grades to control the brightness of lamp. After connected to power supply, the light is not on, then you cantouch the lampshade metal shell for the first time. The bulb will emit low bright light. To touch it for the second time, the bulb will emit middle bright light, to touch it for the third time, the bulb will emit brightest light, to touch it for the fourth time, the bulb will off, as it order cycle. The prone failure of this circuit is TRIAC 97A6 breaks down and the poor contact between lampshade metal shell and circuit touch input terminal. When I am debugging this circuit, using GS6061 to replace TT6061 and 1N4007 replace 1N4004, the other components are the same. It is proved that the circuit works well, it can achieve the functions as above. But TRIAC is easy to damage, so you can parallel a protection circuit which is composed of a series of resistence and capacitance on the two terminals of SCR.



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