This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of Electronics Now magazine. The integrated circuit may be an LM339 or another comparator.
This sensitive Japanese mid-wave receiver from the 1960s has an output power of 45 mW and is...
This circuit appeared in a Radio Electronics magazine in March 1962. The circuit uses two...
What's different about this transistorized circuit is the fact that it doesn't use a voltage...