[sdiy] MIDI optocouplers

[Roman]

I've recently tried MOC207. It's pretty slow, but carefully used is enough
for MIDI. If I only had that written down. It required about 300k resistor
from base to ground to achieve good enough shape of MIDI signal.
Collector's resistor was about 2k AFAIR.
I want to also try TLP112. Has anyone used it?

Of course you can use 6N13something or PC900, that's what's mostly
spotted in commercial gear, but where's DIY spirit of wild research then?

Roman

----- Original Message -----
From: "Fredrik Carlqvist" <ifrc at iar.se>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, November 12, 2004 10:15 AM
Subject: [sdiy] MIDI optocouplers


>
> Hi All!
>
> I've tried several optocouplers for MIDI IN, but lately I use SFH620 (and
> TLP620). Since they are AC couplers, I solder the MIDI connector right
100%
> of the time (instead of just 20%). However, they need a very small
> resistance (470 Ohm on a 5V system) on the collector or the rise time is
too
> slow. And that introduces switching noise.
>
> What optocouplers do you use for MIDI?
>
>
> Fredrik C
>