Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz operating on the third harmonic. The transistor admits equivalent.
In the figure we have an amplifier configuration found in an 80's documentation. The power supply is...
This circuit, with printed circuit board included, is from a Radio Electronics magazine from July...
This circuit was found in a 303 Circuits issue of Elektor magazine from the 1990s. The circuit uses...