Harmonic Distortion Analyzer Circuit

  
The circuit includes a low-distortion, 1-kHz oscillator and will measure THD at a user selected voltage level for voltage amplifiers, or for checking amplifiers of power levels to 600 W. It will detect THD levels of .005% (-86 dB). A built-in one-percent THD calibrator is included.
Harmonic Distortion Analyzer Circuit - schematic

The output device is a digital multimeter (DMM).




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