Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

Traditional Neon Flasher (CB14783E)
This configuration, found in many publications, is from an American book from 1981. The power...
Fish Atractor (CB13179E)
The circuit shown is from an American publication from 1970. It produces a tone that attracts fish...
Relay driver (CB20549E)
Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at...