26 May
2004
26 May
'04
7:33 p.m.
Is it possible to attach ( with a proper connector ) an "isolated" midi
device directly to the soundblaster
midi joystick iinterface? I don't feel like building a full opto
isolated pass through interface for this little
keyboard. Just midi in to the computer is OK. BTW, this is on topic, the
KB is over 10 yo.
Thanks,
Jim Davis.
27 May
27 May
1:01 p.m.
Is it possible to attach ( with a proper connector )
an "isolated"
midi device directly to the soundblaster midi joystick iinterface?
I don't think so; one is a voltage-level interface, the other is more
like current-loop. (ICBW, of course.)
However, if "with a proper connector" is taken sufficiently liberally,
the answer is "yes"; there exist interfaces that are built into DA15
shells - you plug the DA15M it into your joystick port, and it breaks
things out into three connectors: a DA15F for the joystick (if any) and
two MIDI connectors for, well, MIDI. Mine cost me CAD 34.45, TTC,
around the middle of last August.
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1:31 p.m.
On Thursday 27 May 2004 17:01, der Mouse wrote:
There's tons of these things on ebay for US$15ish + shipping each.
http://search.ebay.com/midi-cable-joystick_W0QQfromZR8QQsokeywordredirectZ1
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
Is it possible
to attach ( with a proper connector ) an "isolated"
midi device directly to the soundblaster midi joystick iinterface?
I don't think so; one is a voltage-level interface, the other is more
like current-loop. (ICBW, of course.)
However, if "with a proper connector" is taken sufficiently
liberally, the answer is "yes"; there exist interfaces that are built
into DA15 shells - you plug the DA15M it into your joystick port, and
it breaks things out into three connectors: a DA15F for the joystick
(if any) and two MIDI connectors for, well, MIDI. Mine cost me CAD
34.45, TTC, around the middle of last August. 
1:41 p.m.
Quothe der Mouse, from writings of Thu, May 27, 2004 at 06:01:19PM -0400:
two MIDI connectors for, well, MIDI. Mine cost me CAD
34.45, TTC,
around the middle of last August.
Hacking together a very simple circuit with an opto-isolator, a few
resistors, diodes, etc. costs a lot less. There are several circuits
available on the 'net. Just to a search for optoisolator and midi.
--
Copyright (C) 2004 R. D. Davis The difference between humans & other animals:
All Rights Reserved | My VAX | an unnatural belief that we're above Nature &
www.rddavis.org | runs VMS & | her other creatures, using dogma to justify such
410-744-4900 | doesn't crash!| beliefs and to justify much human cruelty.
8:34 p.m.
[...joystick
port MIDI converter...] Mine cost me CAD 34.45, TTC,
around the middle of last August.
Hacking together a very simple circuit with an
opto-isolator, a few
resistors, diodes, etc. costs a lot less. There are several circuits
available on the 'net.
8:55 p.m.
der Mouse wrote:
Sure, and I imagine I could design one myself easily enough - I know
_that_ much about electronics.
But I don't have any suitable optoisolators on hand (I found only one,
and its output device was a mains-voltage triac), and the hassle factor
of obtaining some was enough to outweigh the extra dollars the pre-made
adapter cost me.
Besides, by the time you add in mounting and housing, the cost for the
homebrew has probably at least doubled, in money and time both.
(Granted, its hack value would have been significantly higher that way.)
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I was thinking a simple current to voltage adaptor, maybe 2 resistors
and a transistor that worked and somebody had actually built. I'm sure I
have some optoisolators, and I've seen the stuff on the net.
I was even thinking about a one resistor e-i converter. I've got 3 days
to play with it, I might
end up building the full monty if I can sort through all the junk and
find the parts.
Jim Davis.
[...joystick port MIDI converter...] Mine cost me CAD
34.45, TTC,
around the middle of last August.
Hacking together a very simple circuit with an opto-isolator, a few
resistors, diodes, etc. costs a lot less. There are several circuits
available on the 'net.
28 May
28 May
1:20 p.m.
[...joystick port MIDI converter...] Mine cost me CAD 34.45, TTC,
around the middle of last August.
Hacking together a very simple circuit with an
opto-isolator, a few
resistors, diodes, etc. costs a lot less. There are several circuits
available on the 'net.
But I don't have any suitable optoisolators on hand (I found only one,
and its output device was a mains-voltage triac), and the hassle factor
Raid one from an old SMPSU (they're often used in the voltage regulation
feebcak circuit)?
of obtaining some was enough to outweigh the extra
dollars the pre-made
adapter cost me.
It may not apply here, but I've seen cheap cables and adapters that are
so poorly soldered that you have to completely rebuild them. In which
case it's probably less hassle to make it yourself in the first place.
Besides, by the time you add in mounting and housing, the cost for the
homebrew has probably at least doubled, in money and time both.
I used to estimate {Cost of main components} * 3.
Anyway, if you just want a quick-n-dirty hack why bother to house it?
Mount the board ont he DA15 plug or something.
-tony
3:15 p.m.
Quothe Tony Duell, from writings of Fri, May 28, 2004 at 11:20:52PM +0100:
All Electronics sells some inexpensive cases and connectors. Mouser
stocks much nicer connectors, but not perf board (darn that's become
expensive!) and inexpensive cases.
It's not exactly complicated, the only thing
you'd need would be a spec
of what the Soundblaster was expecting.
Somewhere, I read that some of the newer sound cards don't match the
original Soundblaster spec properly and some of the older MIDI adapter
circuits won't work... a current related issue, IIRC. Can anyone
comment on this?
Raid one from an old SMPSU (they're often used in
the voltage regulation
feebcak circuit)?
Those old PSUs are a source of many useful parts. :-) 4N35s appeared
to be rather inexpensive, so I ordered ten of them and am going to
have a go at building a couple of circuits around them for Mac and PC
MIDI interfaces.
It may not apply here, but I've seen cheap cables
and adapters that are
so poorly soldered that you have to completely rebuild them. In which
case it's probably less hassle to make it yourself in the first place.
Besides, one can modify one's circuitry at a later point in time for
whatever reason, more easily than hacking on one of those cables.
Besides, by
the time you add in mounting and housing, the cost for the
homebrew has probably at least doubled, in money and time both.
I used to estimate {Cost of main components} * 3. Anyway, if you just want a quick-n-dirty hack why
bother to house it?
Mount the board ont he DA15 plug or something.
That's good for uses when cabling isn't going to get disturbed much,
but in cases where it will, I'd go with a cheap project box,
connectors, etc.
--
Copyright (C) 2004 R. D. Davis The difference between humans & other animals:
All Rights Reserved | My VAX | an unnatural belief that we're above Nature &
www.rddavis.org | runs VMS & | her other creatures, using dogma to justify such
410-744-4900 | doesn't crash!| beliefs and to justify much human cruelty.
27 May
27 May
1:55 p.m.
Is it possible to attach ( with a proper connector ) an "isolated" midi
device directly to the soundblaster
midi joystick iinterface? I don't feel like building a full opto
IIRC, the receiver of the midi interface is the opto-isolated part. It's
a current loop with an active transmitter and a passive receiver.
In which case you will need to add an opto-isolator, but probably not
much else. I would think you could build a much cut-down version of the
interface.
-tony
28 May
28 May
4:20 a.m.
I had a Yamaha keyboard back in 1988 that had a non-standard midi output
jack to go to other midi equipment. Patched it right into an old full
length SB16 Pro I had at the time and worked fine. Seeing how Yamaha was
and is one of the more popular companies out there, I don't see why such a
thing wouldn't work or exist. I'm sure there must be some solution out
there for it, hiding. Possibly like when I went looking for a Linux CD I
had... sitting 14 inches from my face, heh. Naw, it's probly available off
epay or some music site. If you want, I'll help search for it if you give
me more info on the keyboard.
-John Boffemmyer IV
At 12:33 AM 5/27/2004, you wrote:
Is it possible to attach ( with a proper connector )
an "isolated" midi
device directly to the soundblaster
midi joystick iinterface? I don't feel like building a full opto isolated
pass through interface for this little
keyboard. Just midi in to the computer is OK. BTW, this is on topic, the
KB is over 10 yo.
Thanks,
Jim Davis.
----------------------------------------
Founder, Lead Writer, Tech Analyst
and Web Designer Boff-Net Technologies
http://boff-net.dhs.org/index.html
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9 comments
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participants (6)
-
ard＠p850ug1.demon.co.uk -
jimmydevice＠hotmail.com -
john_boffemmyer_iv＠boff-net.dhs.org -
mouse＠Rodents.Montreal.QC.CA -
pat＠computer-refuge.org -
rdd＠rddavis.org