So, uh, if you have an M-Audio Keystation Mini 32 and the USB connection is flaky or does not work on some computers, try reducing the series D+/D- resistors from 100Ω to 33Ω and removing the janky looking common mode choke. Turns out following the IC datasheet helps.
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Maybe they needed it to pass EMC
Yeah, but I get the feeling this janky thing isn't rated for differential data.pic.twitter.com/6Qo5Orj11f
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Also USB isn't actually (only) differential, so a common mode choke is a terrible idea.
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Using chokes on the PCB for differential pairs faster than USB Full-Speed is usually a very bad idea, and the USB standard recommends against it.
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yep, thought you meant that was on vbus.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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