MaxiKORG DV800 CV/Gate mod ?

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andrewF
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Post by andrewF » Thu May 23, 2013 5:46 pm

conno wrote: What kind of $ do you need for it? Can you accept a Paypal ?
$20 (includes shipping anywhere)
yes to paypal
:spin:

Atlas Torso
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800dv/770

Post by Atlas Torso » Tue Jun 04, 2013 3:18 pm

Hey AndrewF,

Do you still have some pcb available ?

Many thanks and great work Andrew,really !

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andrewF
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Post by andrewF » Fri Aug 23, 2013 9:03 am

PCBs are back in stock :party:

rimeroni
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Post by rimeroni » Fri Feb 21, 2014 11:46 am

Hi Andrew,

I just started building this and just want to make sure,
I used BC556 & BC550 instead of BC557 & BC547, as I had them laying around. These should be ok right?

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andrewF
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Post by andrewF » Fri Feb 21, 2014 6:55 pm

Should be fine :tu:

asrvegas
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hey

Post by asrvegas » Fri Sep 12, 2014 12:08 pm

need a maxikorg cv gate mod

asrvegas
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maxikorg cv/gate mod

Post by asrvegas » Fri Sep 12, 2014 12:12 pm

Any left?

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andrewF
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Re: maxikorg cv/gate mod

Post by andrewF » Fri Sep 12, 2014 7:00 pm

asrvegas wrote:Any left?
Yes - still got some :party:

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Parnell Paul
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Post by Parnell Paul » Sun Sep 14, 2014 7:32 pm

kaoss wrote:
andrewF wrote:Hi guys
I have actually placed the order for these PCBs
.....only 6 months later :oops:
Just getting 20, 1 is for me, so 19 available.
You will only need 1 PCB for 1 800DV, each PCB has 2 CV circuits and two gate/trigger circuits.

The PCBs will be $20 including shipping to anywhere.
If you want one, just say so on this thread (you can of course change your mind) and I will let you know when they are tested & ready to go.

Given all the hoohaa with xmas & new year I expect they will arrive in mid-Jan.
I'll take one
I'd love to order one board also!!!!!

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andrewF
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Post by andrewF » Sun Sep 14, 2014 11:20 pm

pm'd

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elmegil
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Post by elmegil » Sat Oct 04, 2014 11:52 pm

I have some detail questions that I'm unclear on even after reading the doc and cykong's site and looking through the bundle of images.

Cykong cites a 3PDT and 4PDT switch, but it's not clear at all how he wires those up. I can see a 4PDT for CVs/Gates, and a 3PDT on-on-on for repeat (gate 1, gate 2, stock), but that leaves out the S&H gates??

How did you wire yours up? There's only the one switch listed in your doc (for the repeat gate), and from the way I read that it goes to where there's yet another switch in the list of GIF/JPG diagrams.

The other question is where did you mount it? Cykong's stripboard has holes that line up with the screws in the voice board, but the holes in your PCB don't. They *almost* line up between one of the voice board screws and one of the brown PCB screws, but it's off by about a mm or so which leaves me concerned that the mounting won't work well there. Suggestions?

Thanks....

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andrewF
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Post by andrewF » Sun Oct 05, 2014 9:23 am

The PCB just goes either in the floor of the case or my original one (on veroboard) was mounted to the back of the case. I never planned it to line up with any mounting holes, there is plenty of space to mount it under the PCBs.

Sorry it is not clear but the wires from the mod PCB to the various points on the Korg should go via switches, so you can select external gate/CV or original Korg setup. I used to have a spdt switch for each one....forget maybe 6 or 8, all on the back of the case. I replaced the socket panel with one of my own.

As my 800dv no longer has a keyboard I no longer have any switches and the external inputs are always 'on'.
I'm not entirely sure what cykong is doing with those rotaries either, I pretty much stuck to the e-lab design.

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elmegil
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Post by elmegil » Sun Oct 05, 2014 11:27 am

Great, thanks for the info :)

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elmegil
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Post by elmegil » Mon Oct 06, 2014 10:40 am

I'm still scratching my head over the switch layout. I'm not entirely clear on how the S&H and repeat functions work on this synth (owners manual... less than clear :) ), so I'm going to bounce my ideas here if anyone wants to let me know if they make sense, or if I'm way off in the weeds.

So:

Switch 1: 4PDT, both CVs, both EG/Bend/Vib gates, basically on or off for the the external capabilities. Could conceivably do two 2PDTs if I wanted to do upper and lower separately.

Switch 2: DPDT on-on-on (aka 3PDT on-on-on), repeat gate, up connects in the upper voice's external gate, center is normal, down connects in the lower voice's ext gate.

Switch 3: DPDT on-on on, S&H gate, up connects in the upper voice's external gate, center is normal, down connects in the lower voice's ext gate.

I don't see any good way for me to combine switches 2 & 3, and I think the main thing that is confusing me is whether it makes sense to have the repeat & S&H gates separate from the EG gates.

Thoughts?

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elmegil
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Post by elmegil » Fri Oct 24, 2014 8:49 am

I just got the first switch described above completed last night (had a delay due to a bad switch and no spares), and external is really really weird. If I hold a key on the keyboard, it works as expected. If not, I get whatever the last note the external played repeated with the incoming gates.

This prompted further review of the mods and the circuit and I think I realize what the problem is, and the switch model I describe above will absolutely NOT work.

The repeat and S&H gates are integral to each voice ( first of all ) and so independent. And the S&H gate in particular is just the internal hold of the last key's voltage. Lack of familiarity with the keyboard had me confused on that point.

So for external to work correctly, *all three gates* have to be hooked in for the voice in question.

So the right way to wire this for independent upper/lower external control is two 4PDT switches, one for each voice. Each switch then has CV, key gate, rpt gate, and S&H gate enable or disable.

I plead unusual architecture and weird gate routing in my defense for not understanding how it works prior to this. :)


EDIT: And I still have it slightly wrong there. The S&H is per voice, but the repeat gate is not. So I've wired that so that the non-mod internal gate wiring goes to both of the 4 pole switches for the "off" position, and the center on that pole goes to an additional SPDT switch to select whether the repeat gate is fed from the upper or lower voice.

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demian
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Post by demian » Fri Apr 03, 2015 12:56 pm

If you have one more pcb, i'd like to buy it.

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andrewF
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Post by andrewF » Fri Apr 03, 2015 7:40 pm

yes, still have

pm sent

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chiasticon
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Post by chiasticon » Fri Apr 10, 2015 12:24 pm

has anyone tried the Kenton cv/gate kit? seems well done. wondering how difficult it is to install; the manual's not online. it's also not cheap.

kenton 800dv cv/gate kit

RAW2019
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Post by RAW2019 » Thu Jun 25, 2015 3:30 pm

Hi Andrew,

If you still have i like to buy one also.

And does anybody know where the performance tools are inserted into the system? Is that after the keys and before the vco? I love to use those when using cv/gate.

Thanks!

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andrewF
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Post by andrewF » Thu Jun 25, 2015 9:37 pm

yes still have
sent you a message

all the files for mods are
HERE - DV800 mods

and

HERE - PCB build info

emTu
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Post by emTu » Fri Nov 20, 2015 5:39 am

Hi !

Great job. I want one PCB too.

Thanks !

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andrewF
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Post by andrewF » Fri Nov 20, 2015 6:31 am

emTu wrote:Hi !

Great job. I want one PCB too.

Thanks !
Welcome to MUffs

message sent :party:

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Post by modularrydavid » Fri Sep 09, 2016 12:47 am

andrewF

Hi Andrew. Can you refresh my memory on what your 800DV board controls? To be clear, it can control the repeat rates?

Sorry, viewing thread on my phone so hard to read. Let me know if you have any available still. Thanks much.

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andrewF
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Post by andrewF » Fri Sep 09, 2016 12:54 am

Yes in stock, US$20 including shipping by regular airmail.

they have 2 CV inputs for the 2 VCOs
and 2 gate inputs which trigger EG/Vib/Bender, S&H and repeat gate.

Not on the PCB, you can also mod VCF cutoff, but this is just a 22k resistor from the jack to the circuit

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kipervarg
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Post by kipervarg » Mon Dec 12, 2016 2:37 am

Does someone have their Maxikorg easily accessible and can measure the length/width? Planning a rack to hold it and it's not yet in my possession.

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