This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be used as a shield and the frequency is approximately 775 Hz.
With this circuit it is possible to adjust the active cycle of the generated signal in a wide...
This circuit was found in a Japanese magazine from 1971. The circuit uses Japanese transistors of the time,...
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...