[sdiy] USB-C experience

Sean Ellis tensiontype at hotmail.com
Fri Sep 29 23:54:58 CEST 2023

Using this connector as a DIY multicore between patchbays basically.

From: Tom Wiltshire <tom at electricdruid.net>
Sent: Friday, 29 September 2023 11:26 PM
To: Sean Ellis <tensiontype at hotmail.com>
Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] USB-C experience

Please, can I understand what you're trying to do here?

You're piping CV signals down a cable that was designed for packet-based digital comms? But you'Re not digitizing them first? Or wrapping them up into USb packets or any of that stuff? Just using the cable as cable, right?


On 29 Sep 2023, at 21:31, Sean Ellis via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:

(I made this post on wigglers but I'd like to share here. I'd love some feedback from people who might have opinions. https://www.modwiggler.com/forum/viewtopic.php?p=4036980<https://www.modwiggler.com/forum/viewtopic.php?p=4036980>  )

I've spent the last few weeks investigating buss cables for running between cabinets and I'll save people the trouble with USB-C. On paper it could be handy being so small and so many lines, for CV it would work but there are some showstopper issues.

Firstly the connectors are SMT only, and even then virtually all connectors have to go through an oven or hot air to make proper joints. You can't physically get under them with an iron so are rather unfriendly for even prototyping.

Secondly there are approximately 9000 different footprints with little in the way of a standard. Identical looking parts are off by 0.25mm and don't fit.

Third the reversible nature is a waste for us. You need to find a solution for keying them to make use of the full cable. (design specific...)

Lastly, it's 24 pins! On paper 24 pins.....in reality it's 18 or less. All the cables I've tested have merged the power and ground lines within the cable. This is sadly not written in the spec so I wasted money on boards that didn't account for that. I guess you could make your own cables using the male plugin boards but what's the point.

Stick to HDMI or another type even if only carrying CV. Wish they'd mention somewhere in the spec that the power pins are merged as a rule.

(There's more in the thread about the cable issue)
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