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Touch Switch Circuit

2015-09-03 02:35  
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When the touch-on contacts are bridged, pin 6 of Ul-b goes low, which forces its output (the set output) at pin 4 to go high. That high divides along two paths; in one path, the output is applied to pin 2 of Ul-a, which causes its output at pin 3 to go low. That low is, in turn, applied to pin 5 of Ul-b, which latches the gate in a high output state. In the other path, the output of Ul-b is used to drive Ql. When Ql turns on, U2`s internal LED lights, which turns on its internal, light-sensitive, triac-driver (diac) output element.
Touch Switch Circuit

The triac driver feeds gate current to TR1, causing it to turn on, and light the lamp (11). When the off contact is bridged, IJl-a`s output switches and latches high, causing Ul-b`s output to go low, turning off the lamp.



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