i'm working on a small box that'll mix the line outs from 2 pc's into a headphone amplifier.
The mix is a straight 50/50 -- summing, essentially.
I could use a few opamps to do this - mix into one amplifier, then a pot, then feed an audio amp, but a good engineer is one that can do for $0.50 what others do in $5!
I'm wondering if I could use summing resistors are the input to an inverting opamp (with vref on the positive input) and then use a single rotary pot as my feedback resistor (rf). As RF gets closer to zero, then my gain should drop to 0 as well.
What are the pitfalls I haven't thought of?
Cheers
Dafydd
The mix is a straight 50/50 -- summing, essentially.
I could use a few opamps to do this - mix into one amplifier, then a pot, then feed an audio amp, but a good engineer is one that can do for $0.50 what others do in $5!
I'm wondering if I could use summing resistors are the input to an inverting opamp (with vref on the positive input) and then use a single rotary pot as my feedback resistor (rf). As RF gets closer to zero, then my gain should drop to 0 as well.
What are the pitfalls I haven't thought of?
Cheers
Dafydd