Regenerative receivers infuriate some but fascinate me. Badly built ones can squeal and drift but a well built set, picking up signals from around the world with just one or two transistors, is a thing of beauty.
If you are not familiar with a regenerative receiver they use positive feedback (regeneration) that increases a circuit's gain. This also increases its selectivity to allow it to better pick signals out. And when the detector is lightly oscillating it produces a beat signal useful for receiving CW and SSB signals.
Here are some regens I have tried.
Listening with an HF regenerative receiver
An older HF regenerative receiver (but still solid state)
One valve regen receiver runs off 12 volts
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