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Circuit Bench

  • VHF to AM converter (CB13457E)

      With this circuit, obtained from an American publication for radio amateurs in 1976, it is...

  • Lie Detector (CB17654E)

      Small variations in the resistance of the skin of a person holding the electrodes can be detected by...

  • Phone noise canceler (CB9402E)

      This circuit was found in a 1967 American documentation. The circuit uses components of the time,...

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