Suggested by an American publication, this circuit has 5 operating conditions indicated in the diagram. The circuit can be designed based on modern equivalent transistors.
This metronome circuit was found in an American 1980s documentation. The circuit uses the 4001...
This circuit was found in an American 80's documentation. The transistor is of germanium of the...
You can adjust the frequency produced by a ring oscillator with three inverters inserting a...