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Re: Schema for 12/24 dB filter cutoff slope mod: new file (JPG) and photo uploaded

2012-11-12 by AARON

Hi all,

I'm a new member here, but certainly not new to the Poly 800 (I own two) or modding (I've done the Moogslayer mod on one of my machines).  

I'm glad I found this particular thread.  Before I became a member today, I found a 2003 thread regarding this mod by doing a Google search.  It said to use the NEGATIVE lead of C103.

So last night, I excitedly got to work on the mod, wired it up exactly as instructed and got ... well, a big bunch of nothing.  No sound at all.  So, I had to replace C103 with a new 10uF cap (since I'd already cut the negative lead loose from the board), and the synth now works again. 

Tonight, I'll try 'er again with the revised instructions.  I may just replace C103 with a 10uF axial-lead capacitor (soldering in just the negative lead, of course) to make the job a bit easier.  I'm eager to hear how this mod sounds!

Cheers to Dave for sharing the revised info (in 2007).

Aaron 

--- In korgpolyex@yahoogroups.com, "Dave Bowman" <davidmochen@...> wrote:
>
> Hi all,
> 
> Having been requested by a member of this NG to provide some details 
> about the 12/24 mod (which of course I didn't happen to create, but 
> nevertheless managed to implement succesfully), I just uploaded a jpg 
> file to the Files section and a photo to the Photos section in my 
> album (Dave's Poly 800).
> 
> I hope this may be of help, since the mod's description featured in 
> an older post, though useful, unfortunately has a mistake as regards 
> the C103 capacitor's polarity.
> 
> I performed the mod exactly as is described in the pic/file, and it 
> works fine.
> 
> Sorry for the spellcheck lines under the words... I created the 
> schematic using Microsoft Word and forgot to turn the autospell 
> feature off... it's late here in Argentina and I should collapse in 
> bed right now!
> 
> Cheers,
> 
> Dave
>

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