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 Forum index » DIY Hardware and Software » The layout factory
MS-20 VCF Euro Format (working with sample)
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jbeuckm



Joined: Nov 30, 2008
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Location: minneapolis
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PostPosted: Sun Nov 29, 2015 6:37 pm    Post subject: MS-20 VCF Euro Format (working with sample) Reply with quote  Mark this post and the followings unread

This is almost the SchmitzBits schematic but I didn't have a log pot for resonance so the sample is with a linear resonance pot.

Eagle files and a panel layout here: https://github.com/jbeuckm/MS20-VCF


ms20_vcf_pcb.png
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CV2 with attenuator is available inboard and could also be installed.
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ms20_vcf_pcb.png



ms20_vcf_ramp_sample.mp3
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This shows the LPF input for 30seconds, then the HPF input for the next 30s.

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 Filename:  ms20_vcf_ramp_sample.mp3
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isak



Joined: Dec 13, 2009
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Location: Israel
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PostPosted: Thu Dec 17, 2015 12:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for your work Smile

Hope you can do the polivoks vcf next Wink

Cheers,
Isak E.

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jbeuckm



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PostPosted: Thu Dec 17, 2015 9:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Maybe I will. But, where do I get NTE888M?
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jbeuckm



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PostPosted: Thu Dec 17, 2015 10:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Because of the LEDs, I noticed that I can make the filter self oscillate at very low frequencies UNTIL I plug a cable into the output - then the lights go dark. I wonder if an output buffer would help maintain whatever is going on there when audio is connected?
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isak



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PostPosted: Thu Dec 17, 2015 10:58 am    Post subject: Reply with quote  Mark this post and the followings unread

You can use an LM4250 instead Smile
You just need to change two resistor values.
See all in here:
http://m.bareille.free.fr/modular1/vcf_polivoks/vcf_polivoks.htm

And to this scheme there are also small mods, maybe consider doing them as well Smile
http://modularsynthesis.com/kuzmin/polivoks/djb-polivoks_schematic.jpg

You can read all about it here:
http://modularsynthesis.com/kuzmin/polivoks/polivoks_vcf.htm

Thanks again for your hard work!

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isak



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PostPosted: Thu Dec 17, 2015 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

jbeuckm wrote:
Because of the LEDs, I noticed that I can make the filter self oscillate at very low frequencies UNTIL I plug a cable into the output - then the lights go dark. I wonder if an output buffer would help maintain whatever is going on there when audio is connected?

What scheme did you used?

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jbeuckm



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PostPosted: Tue Dec 29, 2015 12:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's this with 13700 directly subbed for ca3080:

http://www.schmitzbits.de/ms20.html

Does anyone know where to get an Eagle library for the LM4250? I'm working on Polyvoks Smile

Update: I found the package here: https://github.com/pichenettes/shruthi-1/blob/master/shruthi/hardware_design/pcb/Shruthi-Analog-Polivoks-v01.sch

Last edited by jbeuckm on Tue Dec 29, 2015 12:59 pm; edited 1 time in total
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isak



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PostPosted: Tue Dec 29, 2015 12:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Holy s*** Smile
Wow man, thats is amazing!
Ill look for you the eagle files Smile

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isak



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PostPosted: Wed Dec 30, 2015 3:28 am    Post subject: Reply with quote  Mark this post and the followings unread

You can use 741 as an eagle library.
Its the same pinout Wink

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