Mini Organ (CB21653E)

This toy organ was found in Popular Electronics from January 1967. It can be constructed from modern equivalent transistors.

Geiger Radiation Detector (CB18334E)
This circuit is from a Japanese publication in 1967. The circuit uses a Geiger-Muller valve and...
555 interval timer (CB9524E)
This classic windscreen wiper interval setup was found in American documentation from the 90s. The...
Unijunction Pulse Generator (CB13328E)
This circuit is from old documentation and can be assembled with 2N2646 for the unijunction and...