This circuit was found in American documentation from 1966, but it can be assembled with a modern equivalent transistor. The circuit is based on a mechanical tuning fork with a coil feedback system.
August 2016 - It can be obtained from Mouser Electronics new operational amplifiers with extremely low...
The output voltage of this circuit is approximately four times the supply voltage. The circuit is from...
The galena XTAL is replaced by a germanium diode in this Project. Diodes such as the 1N60 or 1N34...