We found this circuit in the 1983 edition of the Electronics Experimenter handbook. The circuit uses components that are common today, although many admit equivalents.
This circuit generates 500 Hz rectangular signals. The circuit is from old American documentation. Neon...
This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit is...
In the figure we show how to use a small Hartley oscillator as a continuity tester. The component...