This decorative object was found in a Signetics documentation from the 60s. The circuit uses neon lamps and must be powered by a high continuous voltage. The current is extremely low.
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...