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 Forum index » DIY Hardware and Software
Ms-20 filter with dual ota
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softfin



Joined: Oct 11, 2006
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PostPosted: Sun Sep 23, 2007 3:24 am    Post subject: Ms-20 filter with dual ota Reply with quote  Mark this post and the followings unread

Due to the new forum rules I decided to delete the schematic. I'm sorry.
Last edited by softfin on Wed Dec 22, 2010 1:01 pm; edited 1 time in total
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creekree



Joined: Mar 30, 2006
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PostPosted: Sun Sep 23, 2007 1:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

neat, thanks for that!
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shawn



Joined: Dec 13, 2005
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PostPosted: Sun Sep 23, 2007 8:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Man, thank you for sharing this!
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bubblechamber



Joined: Nov 04, 2006
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PostPosted: Mon Sep 24, 2007 5:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice job. I just breadboarded it and work straight away. I need to do some fine tuning. thanks for putting this up. I'll try and get a pcb done this week and post it.
[/i]
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softfin



Joined: Oct 11, 2006
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PostPosted: Thu Sep 27, 2007 5:20 am    Post subject: Reply with quote  Mark this post and the followings unread

bubblechamber wrote:
nice job. I just breadboarded it and work straight away. I need to do some fine tuning. thanks for putting this up. I'll try and get a pcb done this week and post it.
[/i]


Nice to hear this! I'll definately do a dual ms-20 unit with your layout assuming it will be a good one Smile Btw, there are great instructions on how to couple two ms-20 filters together on Scott Stites site, check them out!
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bubblechamber



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PostPosted: Thu Sep 27, 2007 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have looked at Scott's site on how to connect 2 and I'll be using that as a guide, sort of. I'm doing some experiments in adding CV to the Rez, I'm using an old EFM design + the original layout, I'm cautiously optimistic. and I'm thinking about adding a 4069 based distortion option, like Fonik did on his new Wasp filter, sort of. And I'm going to try and add bandpass to it as well.
Hopefully I'll have something to show next week, or at least some audio clips. I really like the way this filter sounds...
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bubblechamber



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PostPosted: Thu Oct 18, 2007 5:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

sorry, I got a little distracted with something else...I'm etching the first board tonight and hopefully I'll have some samples and pics tomorrow. the breadboard version sounds great. if this goes well, I should have a PCB finished and posted next week.
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Sebo



Joined: Apr 27, 2007
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PostPosted: Fri Oct 19, 2007 8:16 am    Post subject: Reply with quote  Mark this post and the followings unread

That's great bubblechamber, i like to try the PCB!!!
Thank you.

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ENDIF



Joined: Jul 14, 2006
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PostPosted: Fri Oct 19, 2007 6:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

If it goes well, perhaps that can be the prototype for a run of PCBs?
=]

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Peake



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PostPosted: Sat Oct 20, 2007 1:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is a reduction of the Korg 35 IC, if anyone's interested. I don't know if it'd work or how it'd sound, if anyone is interested in going the long route... Cheers on making PCBs!

http://picasaweb.google.com/lh/viewPhoto?uname=RMCsynthesisers&aid=5005548513980958289&iid=5005556605699346578
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ericcoleridge



Joined: Jan 16, 2007
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PostPosted: Sat Oct 20, 2007 6:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've seen alot of schems of the web for the later Korg35 filter, but not so much for the other.
I thought this was strange because I would presume that the discrete filter would be easier to clone.

edit:
I'm not sure anymore which MS20 VCF version was early, and which was late, but this Rene Schmitz layout is for the 'discrete' non-korg35 MS20 VCF and is here:
http://www.analog-synth.de/synths/mod2/ms20filter/rene_ms20_filter_clone%20rev%204.pdf

I've made a couple of these, and played them side by side with an MS20-- they're pretty much exactly the same--really great.

Last edited by ericcoleridge on Tue Jan 27, 2009 10:07 am; edited 1 time in total
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Peake



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PostPosted: Sat Oct 20, 2007 8:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have no idea which one is better-sounding/more desirable. That's partly why I'm throwing this into the mix, as I hope to learn from just such discussion.

I've had a few MS20s over the years (when things were cheap), but I couldn't tell you which had what, as I've never side-by-sided the versions. I have with the MKS80 versions, however. That post is in the AH archives.

I -have- heard some of the "clones" and filters based, even generally upon the MS, and only the Analogue Solutions Vostok had some dirt and overload. The others sound rather clean and open, which disappointed me. MS20 users all find the sweet spot of having both filters highly resonant and very close together in Fc. They puff and blur very nicely this way. That's what I want. Sorry if this is resulting in a thread hijack. I should just find these things myself and keep quiet Wink

I want to know! More importantly, I want to build these cool circuits, and thank those who are making them up.
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bubblechamber



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PostPosted: Sat Oct 20, 2007 9:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

well, here's what my first board sounds like. there was a bit of trouble shooting and hopefully more progress tomorrow. this sample is Low Pass only, sweeping up and down. Resonance comes in about half way.


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rubendelacosta



Joined: Dec 25, 2005
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PostPosted: Mon Jan 26, 2009 6:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

humm...sorry, dumb question here

what is this?: Posted Image, might have been reduced in size. Click Image to view fullscreen.

some cmos gate?(i'm not kidding i don't know Embarassed )
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Mon Jan 26, 2009 6:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

rubendelacosta wrote:
some cmos gate?(i'm not kidding i don't know


Can imagine, it's usually drawn differently ... but its the extra darlington transistor buffer inside the OTA (13600), so it's actually part of the IC left of it. See for instance : http://www.b-kainka.de/Daten/OPV/LM13600.pdf

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frijitz



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PostPosted: Mon Jan 26, 2009 6:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

rubendelacosta wrote:
humm...sorry, dumb question here

what is this?: Posted Image, might have been reduced in size. Click Image to view fullscreen.

some cmos gate?(i'm not kidding i don't know Embarassed )

Those are the built-in buffers of the LM3700 chip. The pin numbers are the pins on the 13700.

Ian
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rubendelacosta



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PostPosted: Mon Jan 26, 2009 6:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

aah
i've never seen it drawn like that

thanks,
i'll try to build it tomorrow
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StephenGiles



Joined: Apr 17, 2006
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PostPosted: Tue Jan 27, 2009 3:41 am    Post subject: Reply with quote  Mark this post and the followings unread

It's often drawn like that I think.
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rubendelacosta



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PostPosted: Thu Jan 29, 2009 7:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

am i missing something or a two ways switch would do the job here?
like this:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

thanks,
ruben
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habibelhabab



Joined: Mar 04, 2010
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PostPosted: Wed Apr 14, 2010 5:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

ik think the result in high pass mode is better if you inject the input signal into ungrounded C3. (like suggested elsewhere)
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