The chances are that many of you will have made an FM “bug” style transmitter, a simple one-transistor oscillator usually ...

[Qrp-Gaijin] shows how to do it with a single transistor. You can see some videos ... He found that his original oscillator was driving an overtone crystal at its fundamental frequency.

If made with a field effect transistor, then “A” is a source follower. The concept itself remains the same. Each oscillator works because the RLC network develops a voltage step-up at the frequency of ...