Found in a Hands On Electronics from the 80's this circuit allows the reading of low resistances in a common multimeter. The circuit consists of a constant current source.
This circuit is from 1995 documentation. In the original, the source is symmetrical at 12 V, but...
We found this circuit in a 1988 documentation. It is a protective system that automatically shuts...
Found in the September 1982 issue of Radio Electronics magazine, this circuit triggers a relay...