We found this circuit in an 80s Intersil documentation. Modern equivalent operating systems can be used. The potentiometer adjusts the detection level.
This configuration is from a 1964 US documentation valid for any FET. The range of power voltages...
Only the right combination of the positions of the 6 rotary switches of 1 pole x 10 positions of...
Another of the many anti-bounce circuits that we have in this section of our website. This one...