We found this circuit in a European schematic manual from the 1980s. The circuit is still current, and the transistors used can be the BC558 for frequency crystals up to about 10MHz. Observe the polarity of the power supply.

We found this circuit in a European schematic manual from the 1980s. The circuit is still current, and the transistors used can be the BC558 for frequency crystals up to about 10MHz. Observe the polarity of the power supply.