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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Regenerative receiver (CB22273E)
This simple 1 transistor circuit was found in an American documentation from the 60's. The...
Code practice oscillator (CB7314E)
Found in a magazine 73 for radio amateurs, this circuit makes use of general purpose transistors and...
Automatic Faucet (CB18147E)
The presented circuit allows to control the valve of a tap. The positioning of the emitter and the...