Schematics for the Korg FK-1 and MS-04

[Dan N]

Scroll down to the service documents:

http://www.korganalogue.net/korgother/index.html

Both kind of cool products.

[puretube]

thanks, Dan, for the MS-04 on behalf of jadesky!

[Unbeliever]

Thank you, some stuff I didn't have before.

[puretube]

http://www.diystompboxes.com/smfforum/index.php?topic=29790.0 

[Paul Perry (Frostwave)]

The MS-04 is brilliant but flawed...... the flaw is, how much can you usefully do with only one controller??
But if you ever find one that has accidntally strayed into a guitar shop, buy it (worth $$$ to analog synth guys). Or use it as the ultimate complex LFO generator!

[Dan N]

I've been looking for the MS-04 schematic because I thought it would be a cool lfo to run my FK-1. Looks easy enough, but I'm a little lost in the width section. I can't make out the value of the zener and what the heck is a 10KB CT CC pot. Center tapped counter clockwise?

[puretube]

the "C.T." definitely stands for : centre tapped. (it does have a centre tap);
the "C.C." (if the 2nd letter on that schem indeed is a "C" - might be: L?)
probably stands for the fact, that this pot has a center-detent or whatever the english
expression is for those pots, where you can feel that they`re in the mid-position...

[Sir H C]

Dan-

THanks, that has all the schematics I need, Maxikorg, FK-1, minikorg, sweet!

[theblackman]

ah it seems that ms 04 schematic has been taken down, does anyone have a copy that they can post?

[Dan N]

Ha, looks like that site has more stuff?

I uploaded the schematic to colin's site (http://experimentalistsanonymous.com/):

http://experimentalistsanonymous.com/diy/Uploads/MS04schematic.jpg

Here's a cleaned up-ish (and colorful!)version:

http://users.rio.com/senorris/junk/MS04schematic.gif

I made a pcb, but never tried hooking it up. Scared it would not work, I guess...

[theblackman]

awesome thanks!

zoiks that looks like it might be a hard one to layout!

[Dan N]

PM me if you want a pcb. There is one easily fixed error, and there is only one lfo output.

I never could figure out the zenor value or the resistor going to V+ on that one transistor upper right of the schematic.