[sdiy] MIDI specifications

[harrybissell at prodigy.net]

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...

H^) harry

--------Original Message--------  

From: debus at cityweb.de
To: synth-diy at dropmix.xs4all.nl
Sent: Apr 18 2003 15:47
Subject: Re: [sdiy] MIDI specifications

>Magnus Danielson wrote:
>>>what would this do or prevent? it seems to work as it is.. a small wooden
>>>teabox with some holes for the midi ports i've just soldered wires from the
>>>input-pins to each output pin.
>> 
>> 
>>>From the output you have a current, it's going to drive 5 inputs now, which
>> means that the opto-coupler runs at the fifth of the current it is supposed to
>> run at, meaning less emitted signal and all that. If it works it works, but you
>> have just moved from one case of a limit into another. Also, all of a sudden you
>> want to run another pair of boxes in the same time, so you hang them in too...
>The biggest problem here seems to me is that there are now several 
>LEDs in parallel with a common current limiting resistor. Those with 
>just a slightly higher voltage drop won't light up well.
>> By using a single chip and a small handfull resistors and a opto-coupler, you
>> have built yourself a propper MIDI-splitter. My point is that it isn't as far
>> away, so why not do it properly? As it is now you survive over the weekend, but
>> is it the long-time solution?
>Well, it would need a power supply...
>Ingo


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