We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs operating with both low continuous voltage and high alternating voltage.
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...