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

[René Schmitz]

Have a seperate USB uC as a front end that has an insulation barrier to 
everything else.

Or seperate the Audio Output. (Transformer, Optically)


Best,

  René


Am 02.02.2024 um 12:01 schrieb Vladimir Pantelic via Synth-diy:
> 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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