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Circuit Bench

  • 800 Hz Oscillator (CB9049E)

           This 800 Hz sinusoidal oscillator was found in a 1970s American documentation. The transistor...

  • Microphone Preamplifier (CB18326E)

      We found this circuit in a 1967 Japanese technical magazine. The transistors are made of germanium at...

  • Half Temperature for Soldering Iron (CB17005E)

      This circuit was found in a 1995 documentation, eventually requiring two resistors in series with...

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  • Voltage multipliers (ART600E)
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