[LAU] Galvanic isolation (was: Re: pianos with built in recorders?)

[Will Godfrey]

On Wed, 23 Dec 2015 17:42:29 -0600
"Jonathan E. Brickman" <jeb at ponderworthy.com> wrote:

> 
> > USB MIDI has got the risk to cause noticeable MIDI jitter.
> >
> > Does USB MIDI provide galvanic isolation? Several times I read claims
> > that USB MIDI connections aren't galvanically isolated.
> >
> > Standard MIDI connectors make usage of opto-couplers and shield of the
> > MIDI DIN connectors is open.
> Certainly all of the USB MIDI connections I have ever tested, are not 
> galvanically isolated; I always get trouble with USB signals bleeding 
> over where they don't belong.  USB-to-DIN adapters I have used have been 
> better, but not perfect.  Is there a make/model of USB-to-DIN (or even 
> PCI-to-DIN if it exists anymore) which you know for sure has 
> opto-coupling?  That would be a great boon to me. Sooner or later I'm 
> going to do optocoupling for audio too, probably using a TOSLink setup.
> 
> J.E.B.

There are a number of USB isolators on the market but for some reason none of
them go to the High Speed spec, only Full Speed. However, that would be more
than good enough for MIDI.

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.