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.
Found in Radio Electronics from the 90s, this circuit can vary the frequency in small values...
This circuit was found in a 1960s Motorola documentation. Transistors are types of the time and...
This circuit was found in an old 1970s telecommunication documentation. It is suitable for...