Touch switch circuit

Published:2011/6/19 22:18:00 Author:TaoXi | Keyword: Touch switch | From:SeekIC

The touch switch circuit is as shown in the figure, if you use the finger to touch the pole plate, the pole plate inputs the small AC signal at the pin-8 of the double input port high precision level detector CA3089 to produce the voltage which is higher than the benchmark. In the integrated circuit, this voltage turns the memory trigger, the pin-5 has the high level. The voltage of pin-7 increases to U exponentially in 10 seconds. The 10 seconds is the maximum delay time, the long time touch can makes the circuit to oscillate between the two states of the on-off until the finger removes. The short time touch can make to load to get power, if you touch again, the load will cut off the power.



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