This circuit was found in the Electronics Experimenter Handbook from 1991. The sensor is a diode and the circuit has a relay according to the voltage used in the supply.
The circuit shown was found in a 1988 documentation, giving an indication of value in an...
The simplest version of a ring oscillator using two inverters Iike the one shown in other circuits in this...
This precision circuit can be implemented with other operational ones. We found it in a...