Figure 1 shows a variation on a sine wave oscillator, it uses just two transistors and a single variable resistor to set the frequency. Figure 1 Just a couple of components are needed for a simple ...

[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.

Electromagnetism forms the basis of all mobile communication and radar systems and ... More advanced devices such as High Electron Mobility Transistors and Heterojunction Bipolar Transistors are then ...