Korg Poly800/EX800 Users

Hi Thiago,

welcome to the group!
Please check the "Photos" section in this group and look for 
pic "DSCF0314": There's a connector at the left edge of the main PCB 
with a red, a brown and a black wire. Do you mean this?
It's next to audio connector plugs, so it could be related to your 
problem. You should download the picture and magnify on your display, 
then you can see where it is soldered on.

Hope that helps!

BR,

Olaf

--- In korgpolyex@yahoogroups.com, "THIAGO Montenegro" <thiago@l...> 
wrote:
> Hi to all... This is my first post!!
> 
> I've tried to do the moog slayer mod some time ago and didn't had 
time
> to finished. It was a little confusing to me to know where to cut 
the
> point where knobs go...anyway... Indeed, I didn't even 
started...Just
> opened my 800mkII. But I have the knobs (duh) and I'm just waiting 
some
> free time to do it...
> 
> The sad thing is that I unplugged one black cable and don't know 
where
> it goes. My POLY goes ON fine but no sound goes to the output. It's 
been
> a while and I'm not sure where this cable is placed, but it source 
is
> near other two (black cables) and near where the mod IC's are.
> 
> I'm planning to do it all in one time but I would really appreciate 
any
> help from yours. I know this is not possible only with this post, 
but
> I'll be posting some photos soon. 
> 
> Just want to share my sadness with some other users...BTW, this 
happened

> like 6 months ago and I'm really missing it. 
> 
> Just to finish, some say 10k pots some say 100k, which is better?
> 
> Sorry for the bad English
> 
> Thiago M

Im interesting in getting an answer about the question Thiago pointed...
I own a ex800 and i plan to soon mod it but still i dunno if it's 10k pots 
or 100k pots coz i found different explanations...

Could anyone help?


kaneel
www.mynameiskaneel.com

>From: "Olaf" <olgu@...>
>Reply-To: korgpolyex@yahoogroups.com
>To: korgpolyex@yahoogroups.com
>Subject: [korgpolyex] Re: Failed Moog Slayer MOD
>Date: Fri, 01 Apr 2005 20:55:41 -0000
>
>
>Hi Thiago,
>
>welcome to the group!
>Please check the "Photos" section in this group and look for
>pic "DSCF0314": There's a connector at the left edge of the main PCB
>with a red, a brown and a black wire. Do you mean this?
>It's next to audio connector plugs, so it could be related to your
>problem. You should download the picture and magnify on your display,
>then you can see where it is soldered on.
>
>Hope that helps!
>
>BR,
>
>Olaf
>
>--- In korgpolyex@yahoogroups.com, "THIAGO Montenegro" <thiago@l...>
>wrote:
> > Hi to all... This is my first post!!
> >
> > I've tried to do the moog slayer mod some time ago and didn't had
>time
> > to finished. It was a little confusing to me to know where to cut
>the
> > point where knobs go...anyway... Indeed, I didn't even
>started...Just
> > opened my 800mkII. But I have the knobs (duh) and I'm just waiting
>some
> > free time to do it...
> >
> > The sad thing is that I unplugged one black cable and don't know
>where
> > it goes. My POLY goes ON fine but no sound goes to the output. It's
>been
> > a while and I'm not sure where this cable is placed, but it source
>is
> > near other two (black cables) and near where the mod IC's are.
> >
> > I'm planning to do it all in one time but I would really appreciate
>any
> > help from yours. I know this is not possible only with this post,
>but
> > I'll be posting some photos soon.
> >
> > Just want to share my sadness with some other users...BTW, this
>happened
> > like 6 months ago and I'm really missing it.
> >
> > Just to finish, some say 10k pots some say 100k, which is better?
> >
> > Sorry for the bad English
> >
> > Thiago M
>
>
>

Yahoo! Messenger
Show us what our next emoticon should look like. Join the fun.

On Fri, 1 Apr 2005, guillaume richard wrote:

> Im interesting in getting an answer about the question Thiago pointed... 
> I own a ex800 and i plan to soon mod it but still i dunno if it's 10k 
> pots or 100k pots coz i found different explanations...
==============

50K or 100K would be fine. i wouldn't want to use anything less than 50K.

for best results use audio taper (NOT linear taper) pots. that's more 
important than the actual value.


-- 
         ...atom

  _________________________________________
  PGP key - http://atom.smasher.org/pgp.txt
  762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
  -------------------------------------------------

 	"Have you any idea how successful censorship is on TV?
 	 Don't know the answer? Hmm. Successful. Isn't it?"
 		-- Max Headroom

Can you explain why? Thanks, Joseph

Atom Smasher <atom@...> wrote:On Fri, 1 Apr 2005, guillaume richard wrote:

> Im interesting in getting an answer about the question Thiago pointed... 
> I own a ex800 and i plan to soon mod it but still i dunno if it's 10k 
> pots or 100k pots coz i found different explanations...
==============

50K or 100K would be fine. i wouldn't want to use anything less than 50K.

for best results use audio taper (NOT linear taper) pots. that's more 
important than the actual value.


-- 
         ...atom

  _________________________________________
  PGP key - http://atom.smasher.org/pgp.txt
  762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
  -------------------------------------------------

      "Have you any idea how successful censorship is on TV?
      Don't know the answer? Hmm. Successful. Isn't it?"
            -- Max Headroom




---------------------------------
Yahoo! Groups Links

   To visit your group on the web, go to:
http://groups.yahoo.com/group/korgpolyex/
  
   To unsubscribe from this group, send an email to:
korgpolyex-unsubscribe@yahoogroups.com
  
   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 



__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com

I recently did this mod (about 2-3 weeks ago) on my Poly800 (original MK1). I found and used two different internet articles on this mod (each were a little bit different, one was atom smasher the other some german site I had to translate with altavista and he used all blue wires so I couldn't translate what cable went to what pot, etc. real dumb!). I tried the following different ohmages on my pots: (10k, 50k and 100k). I think I am using the 10k for cutoff and 100k for resonance at the moment. It works ok, but I am not totally satisfied with the range on this yet, so I will probably screw with it some more, but for now these ohmages worked better than using 50k ohm pots for both cutoff and resonance IMO (more range and effect). I recommend testing different ohmage pots to find the way you like it best. Also, be sure that once you have made this mod that you set your resonance and cutoff levels (using the parameter buttons not the knobs themselves to say 50 for cutoff (41) and not
 more than 12 for resonance (42) or you will hear some awful loud squelching.
 
Out of both mod articles the moog slayer says to cut in to the power line, remove the diode on the grounding plate (cardboard piece) and solder into the power line etc. etc. (kindof a pain). Well, when I used this mod, I lose my patches every stinkin time I turn it on (remember I have a brand new internal battery and holder (which works fine BTW). I think by hooking into the power line it is screwing things up, so I just used the other mod which is to just wire the new knobs right into the pots (holes, since the original pot must be removed). I don't have the lost patches as much anymore with it like this and I can actually hear the changes as I tweak the knobs.
 
Definately use audio taper pots they are different. www.digikey.com has them and lots of other cool stuff like the battery holder mod etc.
 
I don't know, this mod was fun, but not really as effective as I was hoping. I spent like $30 on different knobs, battery holder etc., so not too bad, but perhaps not worth the time and money for many. I do wish there was more info on it and better photo tutorials.
 
The black wire probably goes to the ground plate right next to the power supply area (a little cardboard tab on the edge of the board...though I am not sure without pictures. As for you not hearing any sound anymore...Well, that is most likely because you have lost all your patches and you need to reload them from tape or sysex if you have the MKII. Do this everytime you make changes to the mod, or make sure you have a good internal battery (I recommend the battery mod too since you are in there...it's really easy) AND get some C batteries for the keyboard itself too if you can. I don't know about you all, but I lose my patches all the time even with a brand new internal battery in it. Just reaload from tape from your computers sound card it's easy enuf.
 
Hope some of this helps.
 
lanrosta - www.voltagekontrol.com

x x <alienxxx2002@...> wrote:
In the atom smasher example you see 50 k pots.....I used 50 k

guillaume richard <kaneelisdead@...> wrote: Im interesting in getting an answer about the question Thiago pointed...
I own a ex800 and i plan to soon mod it but still i dunno if it's 10k pots 
or 100k pots coz i found different explanations...

Could anyone help?


kaneel
www.mynameiskaneel.com

>From: "Olaf" <olgu@...>
>Reply-To: korgpolyex@yahoogroups.com
>To: korgpolyex@yahoogroups.com
>Subject: [korgpolyex] Re: Failed Moog Slayer MOD
>Date: Fri, 01 Apr 2005 20:55:41 -0000
>
>
>Hi Thiago,
>
>welcome to the group!
>Please check the "Photos" section in this group and look for
>pic "DSCF0314": There's a connector at the left edge of the main PCB
>with a red, a brown and a black wire. Do you mean this?
>It's next to audio connector plugs, so it could be related to your
>problem. You should download the picture and magnify on your display,
>then you can see where it is soldered on.
>
>Hope that helps!
>
>BR,
>
>Olaf
>
>--- In korgpolyex@yahoogroups.com, "THIAGO Montenegro" <thiago@l...>
>wrote:
> > Hi to all... This is my first post!!
> >
> > I've tried to do the moog slayer mod some time ago and didn't had
>time
> > to finished. It was a little confusing to me to know where to cut
>the
> > point where knobs go...anyway... Indeed, I didn't even
>started...Just
> > opened my 800mkII. But I have the knobs (duh) and I'm just waiting
>some
> > free time to do it...
> >
> > The sad thing is that I unplugged one black cable and don't know
>where
> > it goes. My POLY goes ON fine but no sound goes to the output. It's
>been
> > a while and I'm not sure where this cable is placed, but it source
>is
> > near other two (black cables) and near where the mod IC's are.
> >
> > I'm planning to do it all in one time but I would really appreciate
>any
> > help from yours. I know this is not possible only with this post,
>but
> > I'll be posting some photos soon.
> >
> > Just want to share my sadness with some other users...BTW, this
>happened
> > like 6 months ago and I'm really missing it.
> >
> > Just to finish, some say 10k pots some say 100k, which is better?
> >
> > Sorry for the bad English
> >
> > Thiago M
>
>
>





---------------------------------
Yahoo! Messenger
Show us what our next emoticon should look like. Join the fun. 

---------------------------------
Yahoo! Groups Links

   To visit your group on the web, go to:
http://groups.yahoo.com/group/korgpolyex/
  
   To unsubscribe from this group, send an email to:
korgpolyex-unsubscribe@yahoogroups.com
  
   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 


		
---------------------------------
Yahoo! Messenger
 Show us what our next emoticon should look like. Join the fun.

On Fri, 1 Apr 2005, Joseph Ralston wrote:

> Can you explain why? Thanks, Joseph
================

if you look at the ~official~ diagram 
<http://synthmod.net/korg/moog_slayer/> you'll see that both knobs serve 
as variable voltage dividers. that means that FTMP the actual values of 
the knobs don't matter...

voltage divider:
let's say i have a pot with 10V across it. if the slider is 100% CCW it's 
at 0V; at 100% CW it's at 10V; in the middle it's at 5V. that's the same 
whether i'm using a 10 ohm pot or a 10M pot.

of course, if i where using a 10 ohm pot, it would draw 1A (regardless of 
the arm's position). that would cause problems. so, we want to avoid using 
a pot that's of too low resistance.

OTOH if we use a 100M pot then the [tiny] current drawn through the wiper 
arm becomes relevant and interferes with the behavior of the circuit. so, 
we want to avoid using a pot that's of too high resistance.

50K works fine. it seems that 100K also works fine. i suspect that even a 
250K would be fine. but beyond 500K or 1M i suspect that it would cause 
undesirable results, noticeable as an apparent nonliterary in the range of 
the knob.

at the other extreme, i'm sure a 25K pot would work fine. but as the value 
of the pot gets lower, the current drawn through it rises... that could 
cause problems in the form of melted pots and smoked power supplies.

so, my official recommendation is 50K, but you'd also have my blessings if 
you use 100K.


-- 
         ...atom

  _________________________________________
  PGP key - http://atom.smasher.org/pgp.txt
  762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
  -------------------------------------------------

 	"Democracy is a form of government that substitutes election
 	 by the incompetent many for appointment by the corrupt few."
 		-- G. B. Shaw

Cool. Thanks for explaining that. So, the reason you tap into the power supply is that to amp the signal or what is it's purpose? I seemed to have problems losing patches when I used the power supply hook in like you show.
 
Thanks,
 
Joseph

Atom Smasher <atom@...> wrote:
On Fri, 1 Apr 2005, Joseph Ralston wrote:

> Can you explain why? Thanks, Joseph
================

if you look at the ~official~ diagram 
<http://synthmod.net/korg/moog_slayer/> you'll see that both knobs serve 
as variable voltage dividers. that means that FTMP the actual values of 
the knobs don't matter...

voltage divider:
let's say i have a pot with 10V across it. if the slider is 100% CCW it's 
at 0V; at 100% CW it's at 10V; in the middle it's at 5V. that's the same 
whether i'm using a 10 ohm pot or a 10M pot.

of course, if i where using a 10 ohm pot, it would draw 1A (regardless of 
the arm's position). that would cause problems. so, we want to avoid using 
a pot that's of too low resistance.

OTOH if we use a 100M pot then the [tiny] current drawn through the wiper 
arm becomes relevant and interferes with the behavior of the circuit. so, 
we want to avoid using a pot that's of too high resistance.

50K works fine. it seems that 100K also works fine. i suspect that even a 
250K would be fine. but beyond 500K or 1M i suspect that it would cause 
undesirable results, noticeable as an apparent nonliterary in the range of 
the knob.

at the other extreme, i'm sure a 25K pot would work fine. but as the value 
of the pot gets lower, the current drawn through it rises... that could 
cause problems in the form of melted pots and smoked power supplies.

so, my official recommendation is 50K, but you'd also have my blessings if 
you use 100K.


-- 
         ...atom

  _________________________________________
  PGP key - http://atom.smasher.org/pgp.txt
  762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
  -------------------------------------------------

      "Democracy is a form of government that substitutes election
      by the incompetent many for appointment by the corrupt few."
            -- G. B. Shaw




---------------------------------
Yahoo! Groups Links

   To visit your group on the web, go to:
http://groups.yahoo.com/group/korgpolyex/
  
   To unsubscribe from this group, send an email to:
korgpolyex-unsubscribe@yahoogroups.com
  
   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 


		
---------------------------------
Do you Yahoo!?
 Yahoo! Sports -  Sign up for Fantasy Baseball.

MY BRAIN HURTS :D
ok then it may be cause im french and my english towards electronic stuff 
isnt that developed.. need to change that asap :D

>From: Atom Smasher <atom@...>
>Reply-To: korgpolyex@yahoogroups.com
>To: korgpolyex@yahoogroups.com
>Subject: RE: [korgpolyex] Re: Failed Moog Slayer MOD
>Date: Fri, 1 Apr 2005 18:30:59 -0500 (EST)
>
>On Fri, 1 Apr 2005, Joseph Ralston wrote:
>
> > Cool. Thanks for explaining that. So, the reason you tap into the power
> > supply is that to amp the signal or what is it's purpose? I seemed to
> > have problems losing patches when I used the power supply hook in like
> > you show.
>=============
>
>that tap is there to apply a voltage across the cutoff pot.
>
>bear in mind that connecting to ground is also "tapping into the power
>supply."
>
>i never had any problems with lost patches, though...
>
>
>--
>          ...atom
>
>   _________________________________________
>   PGP key - http://atom.smasher.org/pgp.txt
>   762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
>   -------------------------------------------------
>
>  	"This is a bit more than a vote."
>  		-- Oilman Roger Tamraz, explaining why he never
>  		bothered to vote, but did give $300,000 to the
>  		Democratic Party. For his contribution, Tamraz
>  		got a personal meeting with President Clinton,
>  		at which he promoted his Caspian Sea pipeline
>  		scheme.
>  	(Testimony to Senate Governmental Affairs Committee, 9/18/1997)
>
>

On Fri, 1 Apr 2005, Joseph Ralston wrote:

> Cool. Thanks for explaining that. So, the reason you tap into the power 
> supply is that to amp the signal or what is it's purpose? I seemed to 
> have problems losing patches when I used the power supply hook in like 
> you show.
=============

that tap is there to apply a voltage across the cutoff pot.

bear in mind that connecting to ground is also "tapping into the power 
supply."

i never had any problems with lost patches, though...


-- 
         ...atom

  _________________________________________
  PGP key - http://atom.smasher.org/pgp.txt
  762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
  -------------------------------------------------

 	"This is a bit more than a vote."
 		-- Oilman Roger Tamraz, explaining why he never
 		bothered to vote, but did give $300,000 to the
 		Democratic Party. For his contribution, Tamraz
 		got a personal meeting with President Clinton,
 		at which he promoted his Caspian Sea pipeline
 		scheme.
 	(Testimony to Senate Governmental Affairs Committee, 9/18/1997)