Dr.EM
New Member
Hi. This is a very preliminary design for a sort of variable low-pass filter I came up with. I have little knowledge of such things, but i'm certain some of you smarter people will know whether it will work, or how to improve it, etc.
My thinking behind it is simply that the op-amps will act as bufers (the resistor values are guesses). The variable resistor then changes the charge and discharge time of the capacitor; higher resistance = larger charge/discharge times = lower cutoff point.
Well, thats essentially all. I am aware that there are some values missing, so if anyone could help find some appropriate ones, that would be great (also, the 5k and 10k arn't ideal, I would rather have no gain or loss in this circuit, and an input imedance of 10k or so).
Thanks for looking!
My thinking behind it is simply that the op-amps will act as bufers (the resistor values are guesses). The variable resistor then changes the charge and discharge time of the capacitor; higher resistance = larger charge/discharge times = lower cutoff point.
Well, thats essentially all. I am aware that there are some values missing, so if anyone could help find some appropriate ones, that would be great (also, the 5k and 10k arn't ideal, I would rather have no gain or loss in this circuit, and an input imedance of 10k or so).
Thanks for looking!