[sdiy] KorgMS20 mods? help?

[Anthony Rolando]

>I can't
>find anything on the schematic that isn't pretty bog standard. A few
>awkward op-amps maybe, but nothing difficult.

Some of the transistors can be hard to find.


TR

>From: "dj hohum" <djhohum at gmail.com>
>To: "peter edwards" <synth at casperelectronics.com>
>CC: Synth DIY <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] KorgMS20 mods? help?
>Date: Tue, 31 Jul 2007 11:01:10 -0700
>
>On 7/31/07, peter edwards <synth at casperelectronics.com> wrote:
> > Greg and Daryl,
> > Thanks for the feedback. I understand where both of you are coming
> > from. I'm not so concerned with the money value of the MS.
> >   It's in great condition functionally, but it has some body damage
> > that has probably already devalued it a bunch.
> >   And this may be short sited, but I really don't ever plan on
> > selling it.
> > I have a whole bunch of Ken Stone's and Ray Wilson's kits. I'm slowly
> > building a big modular using these boards and a few custom built ones
> > (very simple).
> > My understanding of the MS though is that there are a bunch of
> > incompatibilities with modular synth standards.
>
>I'll let the experts chime in here, but, I'm not convinced that's the
>case. The supply rails are +-15 and everything seems to have standard
>inputs and outputs.  Note on the schematic that many, if not all, of
>the mod sources  are restricted to 0 to 5v.Many look quite simple,
>like the LFO for instance. I'd start there, you can't go wrong by
>cloning what's already there.
>
>I have to say though, popping parts now and again is part of the game.
>It happens when you experiment. Just start cautiously and be prepared
>to fix things if you overstep your bounds so to speak. The great thing
>about the MS-20 is there aren't many (any?) hard to get parts. I can't
>find anything on the schematic that isn't pretty bog standard. A few
>awkward op-amps maybe, but nothing difficult. Hey, I'd never really
>looked at the ms schematics very closely, it's a very clone-able
>machine!
>
>daryl
>
>
> > -pete
> >
> > On Jul 28, 2007, at 5:34 PM, dj hohum wrote:
> >
> > > While I think all of those mods are great and I could hardly be called
> > > a purist, unless those mods are well done you will certainly devalue
> > > your instrument. Fortunately or unfortunately depending on one's
> > > perspective, the MS-20 is one of those instruments that's worth quite
> > > a bit more when in original shape.
> > >
> > > I think greg's advice is solid. If you haven't done things like that
> > > before then starting on an MS-20 is a risky move. Alternatively,
> > > another way to pick up skills and additional modules at the same time
> > > is to build a small companion modular from kits, or, even better, just
> > > circuit boards. I can highly recommend Ken Stone's boards. Building
> > > his boards is relaxing like building a kit but with enough room for
> > > deviation that it doesn't become boring. If you want everything in the
> > > bag for you then both blacet and paia give you everything you need
> > > down to the power cable. While I prefer the blacet build quality I'd
> > > have to give the nod to paia in terms of beginner appeal.
> > >
> > > The thing to get from building is not necessarily just the process of
> > > building, rather, it's to understand how to do the mods that you're
> > > asking for without worrying about frying things. Adding an LFO, for
> > > example, is trivial. You only need to connect it to the power supply
> > > and drill holes.
> > >
> > > But, if you really want to go for it, here's some of what you asked
> > > for:
> > >
> > > http://www.korganalogue.net/korgms/service/ms20/m20s.html
> > >
> > > daryl
> > >
> > >
> > >
> > > On 7/27/07, peter edwards <synth at casperelectronics.com> wrote:
> > >> I see that there's been a fair amount of discussion in this group
> > >> concerning the Korg MS20 (great rebuild by Julian btw!! http://
> > >> www.port23.co.uk/ms20/) so I hope this isn't a tired topic......
> > >> I've owned an MS20 for about 7 years now and haven't had a single
> > >> problem. What a great synth! Now that I've really gotten to know
> > >> every bit of this machine, I'd like to take it further and expand
> > >> it's functionality. I love this synth and would hate to fry it so I'm
> > >> taking the cautious approach and looking to those with more
> > >> experience than I for some pointers.
> > >> I'm interested in adding some controls like a pulse width CV input as
> > >> well as further patching options like ring mod inputs and an EXT in
> > >> mixer. I would also love to add some modules like one or two more
> > >> LFOs and CV mixers.  Has anyone looked into modularizing?? VCO
> > >> outputs, VCF ins and outs. I suspect that it would be more trouble
> > >> than it's worth.
> > >> Anyone out there with some experience who could give me some advice,
> > >> schematics, links, etc...
> > >> I'm not a pro, but I've got some experience and I'm real good at
> > >> following directions.
> > >> Thanks!!
> > >> _______________________________________________
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> > >> Synth-diy at dropmix.xs4all.nl
> > >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > >>
> >
> >
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