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 Forum index » DIY Hardware and Software » The layout factory
Polivoks Euro Format PCB
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jbeuckm



Joined: Nov 30, 2008
Posts: 118
Location: minneapolis
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PostPosted: Tue Dec 29, 2015 2:08 pm    Post subject: Polivoks Euro Format PCB Reply with quote  Mark this post and the followings unread

I'm planning to make a no-wire layout for this filter.

How does this schematic look, @isak?


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jbeuckm



Joined: Nov 30, 2008
Posts: 118
Location: minneapolis
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PostPosted: Thu Dec 31, 2015 10:08 pm    Post subject:   Reply with quote  Mark this post and the followings unread

I reversed the resonance pot, but this works well on 12V.

Happy New Year!


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isak



Joined: Dec 13, 2009
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PostPosted: Sat Jan 02, 2016 11:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Damn man!
Great work!
I dont see you post the files Smile
Did you built it?
How does it sounds?
Please if you dont post the files let me heat the sound! Shocked

Cheers and hapoy new year Smile

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isak



Joined: Dec 13, 2009
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PostPosted: Sat Jan 02, 2016 11:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I see you didnt do the layout with the known mods, as i understand they are very good to add.
Maybe you can add them?
I think it would be easy for you.
The mods are listed here:
http://modularsynthesis.com/kuzmin/polivoks/polivoks_vcf.htm


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jbeuckm



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PostPosted: Sat Jan 02, 2016 1:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

I built and verified that first layout. The github files have the resonance pot corrected and a few tweaks: https://github.com/jbeuckm/Polivoks-VCF

Yes - should be pretty easy to add in the mods.
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isak



Joined: Dec 13, 2009
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PostPosted: Sat Jan 02, 2016 1:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thats cool!
Can you maybe add sound clips please?
Did you built it with LM4250?

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jbeuckm



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PostPosted: Sat Jan 02, 2016 3:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yep LM4250


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AlanP



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PostPosted: Sat Jan 02, 2016 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

http://nz.mouser.com/ProductDetail/Texas-Instruments/LM4250CN-NOPB/?qs=sGAEpiMZZMtOXy69nW9rM8pMfn3Xc4QRCklImShfPEE%3d

This part? I thought that the Polivoks ran on unobtanium, might have to look into this Smile
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jbeuckm



Joined: Nov 30, 2008
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PostPosted: Sat Jan 02, 2016 6:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

I got mine a little cheaper from Digikey:

http://www.digikey.com/product-detail/en/LM4250CN%2FNOPB/LM4250CN%2FNOPB-ND/9489
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isak



Joined: Dec 13, 2009
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PostPosted: Sat Jan 02, 2016 10:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Amazing!!!
Thanks man Smile

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jbeuckm



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PostPosted: Fri Jan 29, 2016 9:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is a working layout with the mods from above. I have not tried the FM input on either layout but the LP and BP are working with Freq/Res controls as expected. I am still figuring out what the "soft" switch does, but it does something.


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polivoks vcf layout with mods
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isak



Joined: Dec 13, 2009
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PostPosted: Sat Jan 30, 2016 3:17 am    Post subject: Reply with quote  Mark this post and the followings unread

cool, thanks man Smile
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