24 Dec
2015
24 Dec
'15
4:10 a.m.
On Thu, 24 Dec 2015 03:58:31 +0100, Ralf Mardorf wrote:
On Wed, 23 Dec 2015 17:42:29 -0600, Jonathan E.
Brickman wrote:
You can solder yourself or buy cables for serial port, resp. PCI
sound card output with such a connector, that have build in
opto-couplers. I remember this very good, because years back, when I
started needing reading glasses, but didn't own them, I tried to
resolder a a self made parallel port cable. I tried to add
^^^^^^^^ serial (I'm sure I corrected the "typo"
before sending :S)
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. opto-couplers and due to the missing reading glasses,
resp. a missing
magnifier, I damaged the jack. The cable worked without opto-couplers
for my serial port, but didn't work for my Envy24 sound cards. I then
ordered a cable for around 10,- € with build in opto-couplers.
I own USB port to MIDI DIN, but never measured if shield is open and
can't take a look inside, but I didn't experience electric noise caused
by the USB to MIDI DIN cable, just jitter. My RME PCIe card has got
break through MIDI DIN. I don't know if inside the connector or on the
board are opto-couplers, but there are no noise issues caused by MIDI
connections and there are no level issues.
Discounter keyboards don't provide MIDI DIN connectors anymore, they
provide USB MIDI onl
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