We found this circuit in a 1965 General Electric manual. The components are from the period. Time resistors and capacitors can be changed.
The LM109, which is not common today, was manufactured by many semiconductor companies. This...
This circuit, published in 1978, can use any general purpose NPN transistor such as the BC548 and...
This touch switch is from a 1978 publication. The circuit should not be powered by a...