Signals of up to a few tens of kilohertz can be generated by this circuit found in a European publication from the 1980s. Transistors admit equivalents and the unijunction can be 2N2646.
The integrated circuit used in this application is the National Semiconductor's LM2907, the...
The frequency of the LC resonant circuit must be the same as that of the crystal and the JFET...
This circuit produces a rectangular signal of approximately 1kHz, rich in harmonics, used for...