Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

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Subject: Re: [PolySix] KORG POLY 6 fixed with klm-367a caveat

From: <backshall1@bellsouth.net>
Date: 2014-12-19

The C23 fix is for clock instability from the ceramic resonator. The original board had 22pF for C23 and 10pF for C22, but the clone board seems to be more stable with 10pF in both locations. Are there some numbers on the cap you have in C23 position? How did you decide what to put in there?
The missing traces are both for the MG circuit (LFO) and should not affect anything else in the programmer section. You can see them on Jed’s page: https://sites.google.com/site/jedjorgensen/klm367a/images/pcb-bugs-errors
 
Don Backshall
 
Sent: Friday, December 19, 2014 6:42 AM
Subject: [PolySix] KORG POLY 6 fixed with klm-367a caveat
 
 

hi all

I'm glad  that my poly six is working great after installing the clone pcb klm 367a.

Although all the analog stuff is fine, I do notice that some digital line "noise" affects the programmer section from time to tine where multiple buttons light up and i have to sort of reset the machine by pressing A button and number 1 button to get back to that patch.  somethines not even that works

 

i thought i saw some fix with " by replacing C23 with a 10pF ceramic capacitor"


Looking at my board it looks like i have a cermaci capacitor in C23 but am not sure of its value.


Also, something about a resistor leg that needs grounding?


What steps have you guys/gals taken to get rid of this pesky "digital line noise:?


Cheers,


Nate