Tuned active antenna (CB8412E)

Found in a 90s Popular Electronics, this circuit allows to select the operating ranges between short waves and VHF. MOSFET is uncommon today.

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TV Audio Amplifier (CB23764E)
This is the typical audio amplifier for a 1967 television. We found it in a magazine from the...
Integrated Alarm (CB16276E)
This alarm is designed for doors and windows, but nothing prevents it from being used in cars,...
1 ns rise time (CB21481E)
With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with...