Simple FM Radio Receiver project
The two transistors in this circuit are very likely intended to be a regenerative detector. Component values of L1 (207nH) and CV (8-28 pF) are chosen to resonate somewhere in the FM broadcast band (88 MHz -to- 108 MHz here).

The circuit is intended to oscillate, or at least approach oscillation. When it oscillates, you should be able to hear its weakly-radiating signal on a nearby FM radio, tuned to the same frequency. CV is a variable capacitor so that frequency can be adjusted. Note that the short antenna wire (no more than about 30cm) also affects frequency.

The capacitor CV looks similar to the one shown below. The rotor with the screwdriver adjustment is connected to one of the two terminals. This connection should go to the ground side of the circuit, so that when a tool is used to adjust, capacitance is affected the least. Even so, frequency will likely change.

 @JRE suggests a path to potentially successful construction.The audio portion of this circuit involving LM386 chip can be built on a breadboard. I would add a 100uF capacitor directly from pin 6 to pin 4, taking care to put the "+" side on pin 6. The two transistors and associated components don't belong on the same breadboard...dead-bug construction might be a good approach.

These regenerative receivers can work surprisingly well, but are notoriously difficult to build properly.


Frequency can vary widely, depending on short wiring paths, antenna length
Regenerative receivers work best when barely oscillating, or almost oscillating. Adjusting components to achieve this operating point is very difficult. (This receiver has no control of its operating point).