True rms detector

  
The circuit will provide a dc output equal to the rms value of the input. Accuracy is typically 2% for a 20 Vpp input signal from 50 Hz to 100 kHz, although it`s usable to about 500 kHz. The lower frequency is limited by the size of the filter capacitor
True rms detector - schematic

Since the input is dc coupled, it can provide the true rms equivalent of a dc and ac signal.




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