This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit can use the 2N2646 for the UJT and the phototransistor can be of any type.
This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply...
This sensitive circuit for triggering relays was found in an old English publication. It works with...
This circuit was obtained from a 90’s Linear Technology documentation. The circuit provides...