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forbin
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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forbin
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8933
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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 Posted: Wed Mar 31, 2010 1:53 am Post subject:
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Hey, thanks for that Forbin!  I'm sure the gang will be delighted!
FWIW, before I sold my last MS20, I duped the filter board (it was the Mk2 version, with the LM13600 (or was that LM137?)), and copied all the values down. Anyway, one day, I will do a clone of that.
I also photographed the external signal processor board. Why no one has done a clone of that yet, is totally beyond me. 
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Wed Mar 31, 2010 1:54 am Post subject:
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| Thank u very much! |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8933
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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| Posted: Wed Mar 31, 2010 2:23 am Post subject:
Re: Korg MS50 VCF board layout |
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| forbin wrote: | | I am posting the board layout as a TIF so that the scaling doesn't get mangled up. |
Thanks! That's very considerate of you. I wish everyone would do the same. Because I use a Mac, many of my pcb design downloads, the scalling was all wrong. Eventually I gave up, because there was too much waste, and too much hair pulling!
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ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Mar 31, 2010 5:57 am Post subject:
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so you used transistors as diodes? nice idea! and i still have some that300 in the drawer...
but wouldn't it be cheaper to just match 4 1n4148 diodes? what is the advantage of using transistors?
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Tech Buddy at Random*Source |
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forbin
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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| Posted: Wed Mar 31, 2010 6:20 am Post subject:
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| true -- i have been meaning to try just 4 matched (and 4 random) 1n4148'3 but just haven't had the time -- the main reason is to provide good thermal bonding as much as anything. Apparently (reading some of the other diode filter designs) the CV rejection is pretty critical on good matching... Laying it out this way does give me the opportunity to do either way... |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Mar 31, 2010 6:22 am Post subject:
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nice.
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matthias
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Tech Buddy at Random*Source |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8933
Location: Birmingham, England, UK
Audio files: 11
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| Posted: Wed Mar 31, 2010 8:37 am Post subject:
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How difficult would it be to convert this filter to high pass?
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ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
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| Posted: Wed Mar 31, 2010 9:42 am Post subject:
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| FWIW, using the original CA3019 doesn't guarantee good CV rejection. I built two copies of this filter back in '95 with that array chip and the rejection is horrible. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Thu Apr 01, 2010 2:47 am Post subject:
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| v-un-v wrote: |
FWIW, before I sold my last MS20, I duped the filter board (it was the Mk2 version, with the LM13600 (or was that LM137?)), and copied all the values down. Anyway, one day, I will do a clone of that. |
I sold my Mk2 version MS20 after building Low Pass and High Pass clones from this artwork--the clones sound exactly the same to me:
http://www.analog-synth.de/synths/mod2/ms20filter/rene_ms20_filter_clone%20rev%204.pdf
| v-un-v wrote: |
I also photographed the external signal processor board. Why no one has done a clone of that yet, is totally beyond me. |
+1 |
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LektroiD
Joined: Aug 23, 2008
Posts: 1019
Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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| Posted: Thu Apr 01, 2010 1:46 pm Post subject:
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Wow! Are any of these due to become available as manufactured PCBs?
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ickystay
Joined: Nov 15, 2006
Posts: 143
Location: Oregon
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| Posted: Sat Apr 03, 2010 1:21 am Post subject:
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| v-un-v wrote: |
I also photographed the external signal processor board. Why no one has done a clone of that yet, is totally beyond me. |
Doesn't that use a four gang pot? Anyway, I'd love to see the photos! |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8933
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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| Posted: Sat Apr 03, 2010 3:11 pm Post subject:
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| ickystay wrote: | | v-un-v wrote: |
I also photographed the external signal processor board. Why no one has done a clone of that yet, is totally beyond me. |
Doesn't that use a four gang pot? Anyway, I'd love to see the photos! |
No four ganged pot in sight! Yes, I'll dig the pix out- maybe tomorrow  (They are on a drive in the loft right now ). It'll be great to have a clone of this. It's the best feature on the MS20 as far as I'm concerned!
_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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ickystay
Joined: Nov 15, 2006
Posts: 143
Location: Oregon
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| Posted: Sun Apr 04, 2010 3:13 am Post subject:
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That would be great! 
(Jeez, we got a lot of smilies  )
I've been trying to summon up the guts to ask an acquaintance to photograph his, but he is very finicky about his lovely gear.
Perhaps start a new thread? |
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Sebo
Joined: Apr 27, 2007
Posts: 564
Location: Argentina
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| Posted: Sun Apr 04, 2010 8:00 am Post subject:
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Hi:
Thanks for the MS-50 VCF PCB, I will be building it in the future...
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Sebo
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My Music:
https://www.facebook.com/cosaquitos/ |
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