Odp: [sdiy] 3.3V and MIDI

[Roman Sowa]

I made MIDI controllers supplied from 2 AAA cells, i.e. 3V
and sometimes less. It worked OK, but some soundcards
wouldn't work well with it. I don't know what soundcards, and
if the adapter was well made at the receiving end, but the
customer complained about it. I use 3 cells (4.5V) ever since.
BTW, I used 150 ohms resistors at MIDI out instead of
usual 220.

Roman

----- Original Message ----- 
From: Bert Schiettecatte <bert.schiettecatte at esat.kuleuven.ac.be>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 07, 2003 12:49 PM
Subject: [sdiy] 3.3V and MIDI


> Hi All,
> 
> I've just received my development kit for Cygnal's microcontrollers. 
> Of course I'd like to add a MIDI interface to it. Unfortunately the 
> development board is all 3.3V, no 5V available. Before I add a regulator,
> I was wondering whether I can just get away with using 3.3V for 
> the midi interface? or does it really have to be 5V to comply with 
> the standard?
> 
> Thanks,
> bert