How to combine a mono and a stereo line inputs

Status
Not open for further replies.

Andy Belov

Well-known member
How to combine mono and stereo line inputs

I'm making a guitar effect "pedal" based on Teensy 4.1 and the Audio Board.
It also has a Line Input, for "play along".
The problem is that the guitar has only one channel, but I have to split one channel into 2 separate preamps only not to cross-connect the stereo Line In.

Is there a better way? How do I add one guitar channel to the 2 Line In channels without mixing the 2 channels together.
Hope I'm explaining it right. I want to have a stereo Line In and add one guitar preamp to it.

Thanks
 
Last edited:
Assuming whatever's driving the line inputs is low impedance output, there won't be a problem passively mixing in the signal to
each channel. Something like a few k ohms resistors would be suitable.

Most audio equipment these days is has output impedances around a 100 ohms or so, and input impedance of 10k to 50k.
 
Silly me, totally forgot about it.
Looked it up and see the resistors suggested ranging from 1K to 220K.

What resistors would be good for the Teensy Audio Board?
I guess 220K will loose more signal and 1K will add too much crossover, no?
 
Status
Not open for further replies.
Back
Top