New simplified schematic available at [ Ссылка ]
Additional schematic available at [ Ссылка ]

FM Regen with loosely coupled antenna, but no filter. Reception is clearer without the filter. Regens are inherently limited in their ability to provide crisp demodulation of an FM signal; that's why they're not used today. They are easy to build however, and don't require any phase transformations or integrated circuits. The lower portion of this video shows the radio with loose coupling and a voltage regulator, the upper portion shows two audio amplifier stages. The design can be simplified by discarding the loose coupling (the second coil) and by using a single stage amplifier.

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