Metal detector (CB7959E)

Found in a 90’s 303 Circuits, this circuit uses components that are still common and has a common LED as indicator.

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Digital control of relays 2 (CB23774E)
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This circuit limits the intensity of an audio signal from a control voltage. The circuit is from a...
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This limiting circuit or Clipper was found in a 1977 documentation. The circuit uses only passive...