owenpauljames
New Member
hi all this is my first post (i think, i have been using this forum for reference for a while),
I was wondering if there is a way of using a voltage, set by a potentiometer, to control the resistance of 2 or more resistors in 2 active filters one band pass and one notch, the resistors set the center frequency of the filters. I have had a go at using n channel jfets, but it seems that getting it to work correctly is very tricky, and as soon as i stop using simulations and get into using real world components with varying gains and tolerences this method just wont work, especially given the control voltage for fets seems to be from 0 to -0.5.
Does anyone have any othere suggestions, e.g. are there ic VCR's? Or if the fet method is the best one does anyone have any tips on how to implement it?
thank you
I was wondering if there is a way of using a voltage, set by a potentiometer, to control the resistance of 2 or more resistors in 2 active filters one band pass and one notch, the resistors set the center frequency of the filters. I have had a go at using n channel jfets, but it seems that getting it to work correctly is very tricky, and as soon as i stop using simulations and get into using real world components with varying gains and tolerences this method just wont work, especially given the control voltage for fets seems to be from 0 to -0.5.
Does anyone have any othere suggestions, e.g. are there ic VCR's? Or if the fet method is the best one does anyone have any tips on how to implement it?
thank you