This circuit was suggested by an Electronic Design from the 90s. Its purpose is to detect resistance relationships in circuits with resistive sensors for control purposes, by firing a relay.
This remote control, which works by a beam of light from a flashlight, for example, can be used to...
We show in the figure how to implement a current monitor circuit using only an operational...
This circuit is from a 1978 French magazine Electronique Pratique. The magazine no longer exists, but...