This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
This circuit with transistors and low current was found in American documentation from the 1980s....
This circuit was found in an American publication from 1965. The circuit uses components from that...
Originally, this 2000 documentation circuit was created to operate as a sensor for the parallel...