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

[Mike Bryant]

It's the multi-layer boards - fix most problems :-)
________________________________
From: Mattias Rickardsson <mr at analogue.org>
Sent: 09 February 2024 19:25
To: Mike Bryant <mbryant at futurehorizons.com>
Cc: Richie Burnett <rburnett at richieburnett.co.uk>; Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] How to design out "usb noise"?

Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> skrev:
Agreed it needs slightly more DSP.  But you probably had to spend longer avoiding any 1kHz getting onto the analogue output.

Getting curious here - is this audioframe-frequency disturbance a common problem? I've honestly not had much issues with it, and it would be handy to understand why. Sometimes on a prototype there's been a little 1.5 kHz tone sticking its head up above the noisefloor, but then my EE looks over his power supply caps etc and then it's gone.

Wonder if it's thanks to the layout, the power structure, the processors used, the multi-layer boards, or just his superpowers? :-)

/mr
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