I'm modifying an audio circuit to add more tone controls, and found a method I want to try.
It involves separating the wanted frequencies into a boost circuit and the less wanted frequencies around the boost circuit.
Instead of filtering them to ground, I've figured out how to do this using a inverting op amp to boost, but the circuit I'm trying to modify uses a non inverting op amp setup and I couldn't find out how to do this.
My idea was to do it using a filter like R4 and C1 in the picture, but I am concerned that this path might create a second feedback loop to the non-inverting input and I dont know what that would cause; So I thought I might ask here.
- Is this the way to achieve what I'm looking for?
- Am I completely wrong?
The schematic is just for proof of concept, in reality I will be using three parallel filters to separately control low, mid, and high frequencies.