This circuit was obtained in an American documentation from the 80's. The transistors can be equivalent to those indicated and the crystal can reach a few tens of megahertz.
This circuit was found in an old Philips publication. The circuit supplies a voltage corresponding to 4.5 V...
This circuit was found in Radio Electronics from the 90s. It uses a transconductance operational...
This 500 MHz oscillator has an output power of 1 W when powered by a 20 V source. The circuit was...