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

[Vladimir Pantelic]

have a look at e.g.

https://waldorfmusic.com/legacy-nw1/

they explicitly state:

"...USB port with *galvanic isolation* for wavetable transfer and text 
input.."


On 01.02.24 23:06, Mike Beauchamp 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
> 
> 
> 
> 
> 
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