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by electronics-diy.com:
This is one of my favorite radio builds just because of how simple it is and how well it is able to pick up a lot of FM radio stations. I have browsed the world in search of a one transistor FM receiver. I have seen a couple but they were always attached to some sort of added device, such as another IC or another transistor for amplification in the receiver itself. Through my continued quest of searching for that too good to be true one transistor, I happened to run across a super-regenerative receiver, by Charles Kitchin, famous for his vast knowledge of regenerative designs. I printed out the schematic and made it. It turned out extremely well.
Simple FM Radio – [Link]
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It might have worked 55 years ago when there were very few FM radio stations to interfere with each other in that very simple circuit. A REAL FM radio has many tuned circuits for excellent selectability.
It cannot pickup weak distant stations and is overloaded by strong local stations.
A REAL FM radio has many gain stages for good sensitivity and limiting and AGC to avoid overload.
Its quench oscillation will probably cause whistles when beating with stereo sidebands today since there was no stereo FM in the old days this circuit was designed.