https://www.aa5tb.com/regen.html
I'm posting it just since I like how well it's designed while being simple, let me start from the input stage, the common gate JFET does multiple duty, not only it acts as an impedance matching device, it also works as a preamp/buffer and, thanks to the very high I/O isolation, it avoids leaks from the regen oscillator to the antenna, at the same time it also avoids that the antenna movements (e.g. wind hitting a wire antenna) detunes thee receiver; the next stage, that is the regen one is nice too, it's built around another JFET and since it uses a variable capacitor for the regen control, I trust the author about the fact that the regeneration is really smooth, and then there's the nice touch of the audio filter, which helps improving the readability and, last but not least important, the voltage regulator which will keep the voltage stable and, by consequence, will stabilize the tuning and regeneration
Again, nothing special, but I like the simple, straight and good design of that receiver, and thought to post it here
P.S. the only thing I'd probably add would be a volume control for the LM386 amplifier; the input attenuator already "doubles" as volume, but sometimes one may want to lower the attenuator to increase some signal while at the same time keeping the volume low
... plus, using for the volume a pot with a switch, will allow to use the volume control as the on/off switch too
I remember how it was an adventure not knowing exactly what the frequency is though, and having to wait for some station ID.