Double-key touch switch circuit diagram using 555 time base circuit
Source: InternetPublisher:super_star Updated: 2020/07/09
The picture below shows a double-key touch switch and a single-key touch delay switch made using a 555 time base circuit. M1 in the picture is the "on" touch chip. When a human hand touches it, the clutter signal induced by the human body is added to the ② pin of the low-level trigger terminal IC of the time base circuit. The circuit is set, and the ③ pin outputs a high level, and the relay K is electrically closed, its normally open contact is closed, and the controlled electrical appliance is powered on. M2 is the "off" touch piece. Once touched, the clutter signal induced by the human body is added to the threshold terminal IC⑥ of the 555, the circuit is reset, pin ③ outputs low level, the relay loses power and trips, and the controlled electrical appliance stops working.
Double-key touch switch circuit made using 555 time base circuit
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