We found this transistorized circuit in a 1985 documentation. The circuit can operate with voltages from 9 to 12 V and the adjustment of the operating point or input sensitivity is done in P1.
In this circuit, Motorola's Linear Interface ICs, R3 is used to compensate to high source...
This powerful pushbutton uses a power MOSFET. We found it in a Popular Electronics magazine from...
This interesting circuit was presented in an article in Radio Electronics magazine in July 1979....