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Korg triple resonator schematics?
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Coriolis



Joined: Apr 11, 2005
Posts: 616
Location: Stilling, Denmark

PostPosted: Wed Sep 27, 2006 12:16 pm    Post subject: Korg triple resonator schematics?
Subject description: Didn't someone here have them? Scott Stites?
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Benn trying to find the schems for these - supposedly they are on Jürgen Haibles site, but I can't find them there!

Anybody got them?

C
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Scott Stites
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Joined: Dec 23, 2005
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PostPosted: Wed Sep 27, 2006 1:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've got'em somewhere. If you go through JH's PS3100 clone, you'll find a modified version of it that he did, which no doubt sounds absolutely out of this world. But, I'll check my archives - I still have it on breadboard, as a matter of fact (very, very sweet function).

Cheers,
Scott
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yusynth



Joined: Nov 24, 2005
Posts: 1219
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PostPosted: Wed Sep 27, 2006 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

These can be found at www.synthdiy.com and also at hypereal, and on RJB sdiy site as well :

http://www.synthdiy.com/files/2006/KORGRS1.gif
http://homepage2.nifty.com/rjb/diy_synthe12.htm
http://homepage2.nifty.com/rjb/pdf/rjb_diy_synthe_701a_resonator_schem_revA.pdf
http://machines.hyperreal.org/manufacturers/Korg/PS-synths/schematics/ps3100-res-1.gif
http://machines.hyperreal.org/manufacturers/Korg/PS-synths/schematics/ps3100-res-2.gif

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Yves
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Coriolis



Joined: Apr 11, 2005
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Location: Stilling, Denmark

PostPosted: Thu Sep 28, 2006 2:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Yves!
I trawled through Jürgens pages on the PS3100, but all I could find (that I could partially understand) was this:. But where is the filter core?
I would like to see what he's done with it, but then again, the circuit looks so simple, even I could probably breadboard it!
I assume those vactrols are VTL5C3/2 types? Or is there some sort of mojo in having 2 separate LED's shine on 2 separate photocells (relating to, say, a diode drop between the 2 LED's in series)?

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yusynth



Joined: Nov 24, 2005
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PostPosted: Thu Sep 28, 2006 2:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Well actually I have no experience with vactrol and LED+CDS at all.
On the RJB site, you have an interesting assessment of both devices. Although it's in Japanese one can get a fair idea (yet weird sometimes) of what is said using the Babel fish translator :
http://babelfish.altavista.com/translate.dyn
http://homepage2.nifty.com/rjb/diy_synthe12.htm

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Coriolis



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PostPosted: Thu Sep 28, 2006 3:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmm, yes I suppose Babelfish helps a bit.
One thing is a bit unclear to me though: is it the filter resonance that is under cv-control, or the frequency? I don't see a frequncy control anywhere, so it would appear that those are preset values... Question

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yusynth



Joined: Nov 24, 2005
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PostPosted: Thu Sep 28, 2006 4:53 am    Post subject: Reply with quote  Mark this post and the followings unread

No, it's the frequencies of the three cells that are under CV, the resonance of these filters is fixed (and is around Q=5).

If you look at the schematic ps-3100-res-2.gif from RJB, you have three pots called 1st peak, 2nd peak and 3rd peak. These let you set the central frequency of each filter. Then a CV applied either to point 7 or 8 or ps-3100-res-2.gif let you modulate the frequencies of all filters.
If you wish you can add also a separate CV for each filter by adding a separate input resistors at the bases of Q102,Q103 and Q104.

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Scott Stites
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PostPosted: Thu Sep 28, 2006 6:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
If you wish you can add also a separate CV for each filter by adding a separate input resistors at the bases of Q102,Q103 and Q104.


I highly recommend this, too - it really adds a lot to the function of the resonator. JH took real advantage of this, and, if I'm not mistaken, was instrumental in the development of the MAM RS3, which is based on the resonator circuit. To get an idea of the effect that can have, read this:

http://www.midiwall.com/gear/rs3.html


Cheers,
Scott
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Coriolis



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PostPosted: Thu Sep 28, 2006 12:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ah, I'm slowly getting the picture...
Think I heard an RS3 demo on the MAM website once - very nice!
I see JH uses 5C4/2's for vactrols.

This is now on my todo list! Very Happy

Thanks guys!

C
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Scott Stites
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PostPosted: Thu Sep 28, 2006 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

First time I ever heard one was on Jeff Pontius' SynthImagery album. I emailed him and asked him what kind of crazy phase shifter he had - he replied that it wasn't a phase shifter, but was in fact the RS3. Later, the first time I visited him, he let me play his Prophet 5 through it - I literally went weak in the knees, it sounded *that* good.

Cheers,
Scott
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sneakthief



Joined: Jul 24, 2006
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PostPosted: Mon Oct 02, 2006 6:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Coriolis wrote:
I trawled through Jürgens pages on the PS3100, but all I could find (that I could partially understand) was this:. But where is the filter core?


Hi Coriolis - The filter core is here in the middle: http://jhaible.heim.at/polykorg/jh_3200_signal_1of4.gif

Jurgen used VTL5C4/2's, while if I'm not mistaken, Scott used VTL5C3/2's.

I was planning on building this for a couple of months now and am about to order the parts for it Smile

What I'm wondering is which one will sound better for this application:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

cheers,
michell

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Coriolis



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PostPosted: Tue Oct 10, 2006 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, thanks for pointing that out to me!
I saw the vactrols, but not the opamps I thought were supposed to be there.
I guess JH used discretes instead.

Vactrols:
If I understand those numbers correctly, then the 5C4/2 is a lot slower to turn on and off, than the 5C3/2, yes?
Which would give a more sluggish, "muddy" sound, I guess.
Don't know if that's desirable in this case, but then JH used them, so...

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sneakthief



Joined: Jul 24, 2006
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PostPosted: Tue Oct 10, 2006 11:25 am    Post subject: Reply with quote  Mark this post and the followings unread

scott told me he used vtl5c3/2's and they sounded great. after perusing all of the schematics, that seems to be a good enough answer for me Smile
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Coriolis



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PostPosted: Tue Oct 10, 2006 9:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

I agree. Also, they seem to be preferred in a bunch of other vactrol circuits I'd like to build sometime, so they would come in handy anyway.

May I ask: Where are you getting yours?

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sneakthief



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PostPosted: Wed Oct 11, 2006 12:31 am    Post subject: Reply with quote  Mark this post and the followings unread

The cheapest electronic supply place for vactrols is here:
http://www.alliedelec.com/

However, it's way easier to order them from http://bridechamber.com (who specialize in modular synth products & parts). They're cheaper than smallbear.

Cheers,
michel

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Coriolis



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PostPosted: Wed Oct 11, 2006 12:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Didn't know that one. A fairly limited selection so far though. And where are they located? US? EU?
Looks like they could get interesting though...

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sneakthief



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PostPosted: Wed Oct 11, 2006 12:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Bridechamber just opened shop in the US a couple of months ago.
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fonik



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PostPosted: Mon Oct 16, 2006 4:02 am    Post subject: Reply with quote  Mark this post and the followings unread

what about
http://www.banzaieffects.com
they're located in berlin, germany
or
http://www.musikding.de
they're situated in germany, too.
both are a good source for obsolete parts and particular das musikding is fast...

cheers,
matthias
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sneakthief



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PostPosted: Mon Oct 16, 2006 6:31 am    Post subject: Reply with quote  Mark this post and the followings unread

if you want vtl5c3/2's, banzai and musikding cost more than twice as much Sad
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