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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?  (Read 8411 times)
Strategy
Posts: 564


Strategy


Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« on: June 11, 2009, 11:15:08 PM »

Has anyone created a perf, strip or p'n'p layout for the Tim Escobedo 9V Sallen-Key/MS-20 filter? I've seen a few snippets of posts about it on this forum, but not layouts.

thanks in advance if you have one to share or can point me to a link!

- Strategy
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #1 on: June 12, 2009, 01:14:56 PM »

I did a stripboard layout a while back. I've never tested it and it's pretty sloppy but it might work, in fact I can't remember if I finished it and the circuit snippets site seems down at the moment. I'll post it if you want.
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Strategy
Posts: 564


Strategy


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #2 on: June 12, 2009, 01:21:12 PM »

Yeah please do, I'll experiment with it and, post updates or conclusions/outcomes as I can! This is really just to experiment with...
Thanks a ton!
- strategy
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #3 on: June 12, 2009, 05:36:06 PM »

As I said it's rough, and I can't remember if I finished it, let me know if it works.

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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #4 on: June 12, 2009, 05:39:04 PM »

actually I think I did finish it, I never tried it though. I just looked at the schematic.
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Strategy
Posts: 564


Strategy


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #5 on: June 13, 2009, 09:37:48 PM »

Thanks for posting, will check it out!
- Strategy
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mr.adambeck
Posts: 257



WWW
Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #6 on: July 12, 2009, 02:42:13 PM »

Did anyone try this out? I would be EXTREMELY interested in building this if it's verified.  icon_mrgreen
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #7 on: July 13, 2009, 02:25:19 AM »

It's on my list of things to do, along with a bunch of other stuff. I was gonna make one to use with an oscillator so I'll probably give it a go soon, I'll let you know how it goes.
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mr.adambeck
Posts: 257



WWW
Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #8 on: July 13, 2009, 10:02:03 AM »

Please do!  Thanks!
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mattusmattus
Posts: 19


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #9 on: July 16, 2009, 12:25:24 PM »

Just built from the layout, all working fine, thanks! Plus it sounds much better than the other simple opamp vcf on escobedo's site. Now just got to look into clipping diode "like in other ms-20 clones".

Probably just being pernickety, but you could add a cable for Res-3 on the b line (the cv one) and make clearer the wire lines between b3 and d3 for capacitor c1.

Thanks again.
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #10 on: July 16, 2009, 02:09:38 PM »

Ah, glad it works, I'd just built one myself but I haven't tested it yet, I'm not sure what you mean about your suggestions though.
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mattusmattus
Posts: 19


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #11 on: July 16, 2009, 03:50:01 PM »

Ah sorry, I meant that there was no offboard wiring detailed for Resonance lug 1 (i said res3 but meant res1!) and C1 is fine really.
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #12 on: July 16, 2009, 03:59:51 PM »

Ah yeah, sorry. As I said, it was a while back I did it, it was just somet I fancied trying. I'll get mine going soon, I was gonna use it with a sequenced oscillator for a friend.
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Br4d13y
Posts: 300


Bradley L


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #13 on: July 16, 2009, 06:49:45 PM »

sorry for showing ignorance, but do these work with guitar?  is there a way to make them work with guitar?
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freedom is the freedom to say 2+2=4
mr.adambeck
Posts: 257



WWW
Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #14 on: July 16, 2009, 08:19:12 PM »

Any chance of some sound clips?  I have a few pedals on my list already, but this is definitely something I'm going to do!
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #15 on: July 17, 2009, 03:24:03 AM »

sorry for showing ignorance, but do these work with guitar?  is there a way to make them work with guitar?

Well I haven't tried mine yet, but Mr Escobedo did adapt it for use with guitar so it should, I'll give it a bash soon and post back.
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #16 on: July 17, 2009, 03:25:42 AM »

Any chance of some sound clips?  I have a few pedals on my list already, but this is definitely something I'm going to do!

I can try, I need to add some soundclips of other stuff I'm building, unfortunately I've no idea how to upload soundclips on the web.
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WhenBoredomPeaks
Posts: 296


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #17 on: July 17, 2009, 04:04:28 AM »

What is this actually? You can connect it to an existing synth or what? (im guessing from the CV stuff)

Or where do you connect the "res", "freq" etc. stuff?
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daverdave
Posts: 265


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #18 on: July 17, 2009, 04:10:13 AM »

What is this actually? You can connect it to an existing synth or what? (im guessing from the CV stuff)

Or where do you connect the "res", "freq" etc. stuff?

It's a variation of the Korg MS-20's sallen key low pass filter, it should make quite a good wah type filter. You should be able to use it ina synths audio path but bear in mind it runs off +9v.

I'll post a clearer layout soon, for now you can use the schematic on Tim Escobedo's site.
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Strategy
Posts: 564


Strategy


Re: Tim Escobedo 9V MS20 / Sallen-Key filter- Layouts?
« Reply #19 on: July 18, 2009, 02:23:37 PM »

I haven't gotten to to build this yet...

It seems like this filter would be most expressive with either an expression pedal input or a CV input- exp pedal obviously better for guitar/bass, CV input for synth/modular applications.

Anyone consider this for the final wiring diagram? ...Possibly borrow the expression pedal input schem from another project?

- Strategy
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