Hey guys,
I recently did a bunch of mods to my Korg Poly 800 and I LOVE the filter. This filter is VERY dramatic sounding and the resonance kicks so much butt it will blow your speakers quite easily! We could totally control it from an AOUT, maybe even J5... it has 12/24 DB (2/4 pole) and it sounds really really good. I have a SID with good OSCs and a blown filter, so I'd love to use it in conjunction with one of these.
I have a Korg DW 6000 with a few broken keys and I don't use it much so I'd like to reuse the filters. It has a total of 6 of these NJM 2069 filters in it. I will put the pinout for this chip below, if someone can help me realize the circuit needed to power this baby, I will send you one of these chips free of charge.
here's a link to how awesome this thing sounds, and after the break, you will find the pinout for the chip:
the mods I did: http://www.synthmod.net/korg/moog_slayer/
some sound examples: http://www.circuitbenders.co.uk/synthmod/POLYEX.html
and the pinout:
1 Audio In GND (GND)
2 Mixer Signal 1 Level CV In
3 Mixer Signal 2 Level CV In
4 VCF Resonance CV In
5 VCF 12dB/oct Audio Out
6 VCF 24dB/oct Audio Out
7 VCA Signal In
8 VCA Level CV Log In
9 VCA Level CV Lin In
10 VCA Signal Out
11 Vss (GND)
12 -Vee (-5v)
13 VCF Cutoff CV Lin In
14 VCF Cutoff CV Log In
15 VCF cap C4
16 VCF cap C3
17 VCF cap C2
18 VCF cap C1
19 VCF Ext Audio In
20 Mixer Signal 2 In
21 Mixer Signal 1 In
22 +Vcc (+5v)
here is a link to a page that has more info about the filter: http://www.sounddoctorin.com/synthtec/korg/njm2069.htm
and attached to this post is a .pdf of the entire schematic for the poly 800 with some pinouts and other details so you can see the rest of the circuit that's used with this filter, I compiled this layout so it's very nice with actual photos and stuff, check it out!
Thanks in advance for your interest, and again if anyone can help me design a circuit to use this filter, I'll hook you up with one or two of these chips! poly schematic for upload.pdf