Korg Poly800/EX800 Users

> Hi to all... This is my first post!!
>
> I've tried to do the moog slayer mod some time ago and didn't had

> to finished. It was a little confusing to me to know where to cut

> point where knobs go...anyway... Indeed, I didn't even

> opened my 800mkII. But I have the knobs (duh) and I'm just waiting

> free time to do it...
>
> The sad thing is that I unplugged one black cable and don't know

> it goes. My POLY goes ON fine but no sound goes to the output. It's

> a while and I'm not sure where this cable is placed, but it source

> 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

> help from yours. I know this is not possible only with this post,

> I'll be posting some photos soon.
>
> Just want to share my sadness with some other users...BTW, this

> 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

>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
>
>
>

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> 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...

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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
>
>
>

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> Can you explain why? Thanks, Joseph

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

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>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)
>
>

> 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.