This is a circuit I'm trying to design. It has the main function of mixing 3 lines into 2 (stereo), but it also includes a variable high-pass filter between the source lines and the "recovery" opamps.
The main reason I chose a non-inverting summing configuration is because of the high-pass filter. It is variable and therefore it would mess with the feedback loop resistor, I couldn't find a simple solution for inverting amp and virtual ground. But now I'm concerned about crosstalk between L1 and L3. I've read crosstalk can be an issue with non-inverting summing amps, but I'm not able to estimate it.
Crosstalk between 1-2 or 2-3 is not an issue for me, since the idea is to blend those channels. But 1 and 3 should stay away because they are stereo.
Maybe there are issues also with the filter cap interacting with the mixer resistors?
Source impedance of all inputs is the same (+/-510ohm).
Could someone please proof read this design/idea for me? Or help me improve it? I'm not so experienced in electronics, but I'm trying to learn with this.
The main reason I chose a non-inverting summing configuration is because of the high-pass filter. It is variable and therefore it would mess with the feedback loop resistor, I couldn't find a simple solution for inverting amp and virtual ground. But now I'm concerned about crosstalk between L1 and L3. I've read crosstalk can be an issue with non-inverting summing amps, but I'm not able to estimate it.
Crosstalk between 1-2 or 2-3 is not an issue for me, since the idea is to blend those channels. But 1 and 3 should stay away because they are stereo.
Maybe there are issues also with the filter cap interacting with the mixer resistors?
Source impedance of all inputs is the same (+/-510ohm).
Could someone please proof read this design/idea for me? Or help me improve it? I'm not so experienced in electronics, but I'm trying to learn with this.
I'm trying to use one amp for both (board size constrains). Any comment on how good/bad the above circuit would behave?
In simulations it seems to work fine, but still have to try breadboard it today.
link: Online simulation here