Simple touch switch circuit with 4011 – source The circuit as you can see from its diagram is very simple and only uses 8 components. The heart of the circuit is the IC CD 4011 that is connected as a ...

This last principle is used in the sensitive switch installation you will be presented ... and D5. The bridge circuit is difficult to identify in the given diagram, but it is made of R2 ….. R4, P1 and ...