Korg Poly800/EX800 Users

http://www.amsynths.co.uk/Filter_Bank/AM8069/am8069.html        used to sell a circuit board (or considered selling) for DIY but he's recently updated all his site and that stuff seems to be missing.

His used +12V and -5V.

The new page is
http://www.amsynths.co.uk/products/filters/am8069-vcf-vca/



On Wednesday, 4 June 2014, 6:24, "Harlan Foster harlan.foster@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:
 


  
Here is some decent info about the NJM2069. Not a datasheet, but better than nothing!http://sounddoctorin.com/synthtec/korg/njm2069.htm




On Tue, Jun 3, 2014 at 6:58 PM, Michael Hawkins korgpolyex800@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:

 
>  
>No one has the spec for the chip. So there's no datasheet to go to unfortunately. I pestered Korg for months. They tried very hard to find the details of it. Oki were also quite friendly but they too could not help.
>
>
>I would check the DW8000 schematic carefully and see what the supply pins are connected to very, very carefully.
>
>
>Pin 22 is Vcc - in the Poly, it's connected to +5V
>Pin 11 is Ground (0V) - in the Poly, it's connected to ground - 0 volts.
>Pin 12 is Vee - in the Poly, it's connected to -5V
>
>
>It makes sense that the thing is CMOS, in which case, it can run in dual supply mode (as Poly above) or in single supply mode (DW8000 perhaps?) where Vcc is +12 and Vee is tied to ground.
>
>
>But you will need to check this.
>
>
>Mike
>
>
>
>
>
>
>On Tuesday, June 3, 2014 9:22 PM, "ackolonges ackolonges@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:
> 
>
>
>  
>Thanks for your feedback everybody.  The values of the capacitors are written in the DW8000 schematics as 0.001 with no units, so I suppose the filter capacitors are all 1n.  By accounts it looks like the positive voltage was +5v in the poly800 and +12v for the DW8000. Since I'd like to use +/-12v standard modular CVs I guess I should go with +12v.  I just hope I don't blow it, since I've only got one. 
>
>
>
>
>________________________________
>To: korgpolyex@yahoogroups.com
>From: korgpolyex@yahoogroups.com
>Date: Tue, 3 Jun 2014 09:59:01 -0700
>Subject: [korgpolyex] Re: About the NJM2069 Chip
>
>  
>yes he did.
>
>I also have had long discussion with Paul about the DW8000 filter board and he said when it came to using a NJM2069 in his synth, he just copied Korg's schematics.
>
>
>
>---In korgpolyex@yahoogroups.com, <josh.nursing@...> wrote :
>
>
>Paul Maddox of Vacoloco has built a standalone synth with the chip.
>
>
>