[sdiy] DIY mixer/console

[Brian Willoughby]

Ha!

Over a decade ago, I started designing one for a musician friend, and stopped when the prototype costs got above $1,000

He wanted a rack-top mounted crossfader and the ability to select from at least four sources to assign to each side of the crossfader, plus effects loops for every input. I recall designing for two stereo VCA circuits plus a lot of analog multiplexers for the routing. There would have been support for presets (rather than have everyone mechanically switched).

A lot of analog multiplexers have a maximum headroom of 10 V peak-to-peak, so I was working with Vishay DGxxx series that can handle 44 V peak-to-peak. I've actually seen commercial products with the 10 V pp mix chips, and they would lock up when the input signal exceeded the power rails.

My (unfinished) design avoided any bussing, which is the biggest challenge because that's where noise can significantly accumulate.

Brian


On Nov 30, 2021, at 09:43, ColinMuirDorward via Synth-diy <synth-diy at synth-diy.org> wrote:
> Who here has done or tried it?
> Please feel free to share pictures, stories, warnings, etc :)
> Cheers,
> Colin