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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Power Control (CB19813E)
This power control for powers up to about 10 W uses wire potentiometers in an arrangement that...
Transistor quick test (CB23769E)
This simple transistor test circuit was found in Radio Elecronics magazine from October 1961. It...
Ring Oscillator 4011 (CB24865E)
Another triggered oscillator that we found in the November 1984 Radio Electronics magazine. The...