This blocking oscillator configuration was found in a 1964 American book. The circuit can be designed with modern transistors and the frequency depends on the transformer.
This is a circuit published in the January 1962 Radio Electronics magazine. The circuit is for...
Taken from a 1967 RCA publication, this circuit maintains a low current in the battery when it is...
This simple pass-through circuit was obtained in an old documentation, but it is still up to date...