It serves as a reference, since today we can have simpler and more compact solutions. This circuit is from an Electronics Experimenter Handbook from 1992. The integrated circuits are from that time.
We found this circuit in Radio Electronics Special Projects from 1992. The circuit turns on the...
This circuit acts on a relay disconnecting the load when the input voltage exceeds the set limit....
This experimental short-range transmitter came out in a 1972 publication and was designed to...