One-transistor oscillator (CB22064E)

Capacitors C2, C3 and C4 determine the frequency of this simple oscillator. Transistor can be general purpose equivalent.

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...