Low-pass filter

  
This nonlinear, passive filter circuit rejects ripple (or unwanted but fairly steady-voltage) without appreciably affecting the rise time of a signal. The circuit works best when the signal level is considerably lower than the unwanted ripple, provided the ripple level is fairly constant
Low-pass filter - schematic

The circuit has characteristics similar to two peak-detecting sample-and-hold circuits in tandem with a voltage averager.



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