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Circuit Bench

  • Shadow Alarm with Intermittent Sound (CB25483E)

      This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...

  • 0.01 Hz to 100 MHz amplifier (CB13396E)

      The circuit shown is from a 1972 publication. Transistors can be current types like 2N2222. The...

  • RF detector with triode (CB20898E)

      Found in an Electronics Now from the 1980s, this circuit is based on grid leakage current for...

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