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Circuit Bench

  • Digital Voltmeter (CB25562E)

      This 4 1/2 digit digital voltmeter circuit was published in the April 1993 Electronics Now...

  • Turn On Switch Using a SCR (CB542E)

    This circuit can turn-on (only) a load (relay or lamp) when S1 is pressed. The circuit can be used as...

  • Signal injector (CB21554E)

      The CK722 transistor used in this circuit is one of the first commercial types in the world. The...

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