[sdiy] MIDI specifications

[Magnus Danielson]

From: harrybissell at prodigy.net
Subject: Re: Re: [sdiy] MIDI specifications
Date: Fri, 18 Apr 2003 11:16:22 -0700

> Though it is very non-standard, you could run MIDI ports
> in series.  I'd consider a current loop drive... otoh that would
> require power AND be a freak as well...

I've thought about this too. If you wire up an op-amp to feel the current
(just toss the negative input of the op-amp on the terminating resistor and
scale the input signal properly before hitting the positive input and then
drive the top with the output. The trouble with this strategy is that you
need all receivers connected at all times... and if you have 5 contacts wired
up and only have 3 devices you plan to have connected, you need to somehow
have the unconnected contacts somehow handled. A breaking DIN-contact could
solve that, but if you only disconnect the other end you are in bad trouble
again. Nah, there's better ways of doing it...

MIDI will however remain to be a cheapertronics interface. We just have to face
the music ;O)

Cheers,
Magnus