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Looking to make a summing mixer?
Old 6th November 2019
Here for the gear

Looking to make a summing mixer?

I'm an amateur tinkerer...

What I want to do, is take two TRS feeds, lets say one of an MP3 player, and one from a computer. And I want to combine them into a single TRS output to my personal headphones.

(in-1) + (in-2) = (out)

However, I would like to be able to control the mix of these two inputs on a single dial. So if the dial is turned all the way to the left, it will be 100% from in-1, and 0% from in-2. And if it's turned all the way to the right, it would be 0% and 100% respectively. And of course, all the various mixing levels in between.

I would also want another dial in the system, which simply controls the overall volume.

Is something like this possible, and easy to make?
Old 6th November 2019
Gear Guru

Yeah, it's probably "very easy". I don't know how to do it though. You can probably just scour the internet and find a schematic of the two required circuits of control; one for the panning (selecting 1 vs 2) and one for overall level.
Old 6th November 2019
Gear Addict

Why not just purchased an inexpensive mixer and be done with it.
Old 6th November 2019
Lives for gear
decocco's Avatar

Originally Posted by Jaxel View Post
Is something like this possible, and easy to make?
Yes. It’s called a crossfader. Consult Google for design examples.
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