benbiles
Member level 4
Hi , I'm trying to work out if the resistor part of an RC passive HPF introduces noise to a signal path.
I would like to use a digi pot to adjust the filter sweep position but wonder if the THD of the resistor is a factor?
I will be using the resistor (digipot ) as a shunt between the balanced lines on an audio input of a preamp.
I can see if you pass the signal directly through a resistor it would introduce noise, but how about in RC filter configuration ?
I would place 2 x capacitor in the hot and cold signal path lines and the digi pot between them in a U configuration.
The idea is to have simple adjustment of a HPF from somewhere between 40khz -> 200khz
I would like to use a digi pot to adjust the filter sweep position but wonder if the THD of the resistor is a factor?
I will be using the resistor (digipot ) as a shunt between the balanced lines on an audio input of a preamp.
I can see if you pass the signal directly through a resistor it would introduce noise, but how about in RC filter configuration ?
I would place 2 x capacitor in the hot and cold signal path lines and the digi pot between them in a U configuration.
The idea is to have simple adjustment of a HPF from somewhere between 40khz -> 200khz