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Circuit Bench

  • Crystal Oscillator LM339 (CB17186E)

      This is one of the possible configurations using the LM139, 239 or 339 voltage comparators. The...

  • VLF Converter (CB7326E)

           Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz...

  • An electric heater (CB24186E)

      This circuit is from a Radio Electronics issue of May 1972. It consists of a commercial heating...

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