RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
This old oscillator using germanium transistors has a high impedance headphone as inductor to...
This circuit oscillates at a frequency of 0.5 Hz. We can find it in an American documentation from the...
The frequency generated by this circuit depends on the crystal used. Frequencies up to a few tens...