[sdiy] How to design out "usb noise"?

[The SynthiMuse]

It seems to me that the only sure way of dealing with it is to power the
USB midi from the USB power and ensure it's all galvanically isolated from
your system.
Gerry


On Thu, 1 Feb 2024, 22:10 Mike Beauchamp, <list at mikebeauchamp.com> wrote:

> I recently stumbled across this post on reddit of someone showing usb
> connection causing some serious noise:
>
> https://www.reddit.com/r/synthesizers/comments/1aghqsa/how_to_get_rid_of_usb_noise/
>
> Some comments suggest to use DIN MIDI instead of USB MIDI as a solution,
> but it got me wondering if there's a best practice for implementing MIDI
> OVER USB output that wouldn't cause this. MIDI spec includes schematics
> for hardware implementation of DIN MIDI connections as we know,
> including the use of opto-isolator, but I can't find the equivalent for
> the USB connection.
>
> A typical USB-B connector has the following pins:
>
> 1. VBUS
> 2. D-
> 3. D+
> 4. GND
> 5. SHIELD
>
> How do you think these connections should be handled inside the synth,
> assuming a hostile environment where connections are also being made
> to/from a PC with audio cables, MIDI cables, power adapters to different
> outlets/circuits, etc.
>
> Mike
>
>
>
>
>
> ________________________________________________________
> This is the Synth-diy mailing list
> Submit email to: Synth-diy at synth-diy.org
> View archive at: https://synth-diy.org/pipermail/synth-diy/
> Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20240201/7981d249/attachment.htm>