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 ...

While additional diodes and capacitors were tolerated in this project, a consequent implementation of a discrete transistor logic clock, of course, does not contain a quarz oscillator.

[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.

For input signals with high noise, a two-transistor cascoded SO is preferable. The output buffer, Q 2, provides protection between the oscillator and the output world. However, if you want to simplify ...