Vintage Synth Repair

Hi!

You can find schematics and more on almost every vintage Korg
synthesizer at this web address http://www.korganalogue.net/

Good luck with your project :-)

Greetings
alpha5000dk - http://www.klejne.dk


--- In vintagesynthrepair@yahoogroups.com, "lostinpurdy"
<lostinpurdy@...> wrote:
>
> Hello, everyone! What can I say? I got this beat up korg 770 which
> technically works (surprisingly) despite it's bad shape, by that I
> mean that the side panels and the face of the control panel is missing
> but the pots, switches, etc are still there. Now first off - where can
> I get something like schematics for the korg 770? Now here's a list
> what I'd like to do but dunno whether to keep the guts in the box or
> take it all out and put in a tiny suitcase a la EMS synthi. Anyways..
> 
> 1. I'd like to make a new panel with add-ons (mods) - anyone got
> experience with that?
> 
> 2. I'd like to replace the Q and Resonance trimmers with dial pots so
> I can control these from the panel (for LPF + HPF seperately) - what
> are the balance pots good for? Settings for the filter switches?
> 
> 3. I want to add a 3-way switch to select which filter filters what
> and  for seperate filtering, so that the LPF and HPF filters don't
> keep eliminating each other when moving the travellers to the opposite
> ends. So where do I make the cut on the Filter board?
> 
> 4. I want to make it safer as in modifying the power supply so that
> the ground goes through the outlet, using a 3-prong cable. 
> 
> 5. Can I just take out the power supply and put it into another case
> of a different material (wood, plastic, fiberglass)? I'm opting to
> take out the power supply entirely and put it in a seperate box and
> add a plug to connect it to the rest of the synth. 
> 
> 6. Is it at all possible to make it battery operable? I know of some
> DIY modulars and minisynths that run on a bunch of 9V batteries and
> would like to do the same thing to my korg. 
> 
> 7. Last but not least - MIDI!! I nead a affordable midi solution, just
> good enough to make it play from a computer or sequencer. Even better
> - 3 midi ins - one for play and one for each of the filters! 
> 
> I know these are a lot of like-to's and wannahave's and honestly doupt
> that I can ever realize them all together but if it's at all possible
> that would be the bomb! 
> 
> Any advice highly welcomed! 
> 
> Wouldn't it be cool if there was a show like "Pimp My Synth"? :P:)
>