This medium power circuit is from an English publication from 1989. The integrated circuits are of types that are still obtainable. The power supply must source at least 2A.
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This complex circuit with many digital components measures inductances in 6 ranges ranging from 100...
This circuit triggers a photographic flash when the microphone picks up a sound. The SCR can be...
This simple MW radio circuit with two transistors was obtained in an Argentine publication from...