General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
This touch switch is from a 1978 publication. The circuit should not be powered by a...
The circuit shown uses the 741 operational amplifier, but lower noise and higher gain equivalents...
We found this zener regulator in a 1978 radio amateur documentation. The operational can be...