Sawtooth oscillator (CB21816E)

This transistor circuit was found in Mullard's 1960s transistor manual. The transistors are germanium from the time.

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Schmitt trigger (CB7983E)
This simple trigger circuit was found in a 90’s American documentation. The integrated circuit is...
Power Outage Alarm (CB24152E)
This sensitive circuit was found in the August 1971 issue of Radio Electronics magazine. The SCR...
Varicap Beat Oscillator (CB25649E)
The varactor or varicap diode tunes the signal for listening to SSB signals on a common receiver. The...