[sdiy] DIY mixer/console

[Ben Stuyts]

I have dabbled in it, long time ago. Made every mistake possible, solved only a few of them. I wish that I had Douglas Self’s most excellent book Small Signal Audio Design. Be sure to read chapter 12 and further about mixer architectures, pre amps, signal switching, summing, etc.

Ben


> On 30 Nov 2021, at 22:40, Brian Willoughby <brianw at audiobanshee.com> wrote:
> 
> 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
> 
> 
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