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 Forum index » DIY Hardware and Software » The layout factory
Polivox VCF layout
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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Thu May 12, 2011 9:35 am    Post subject: Polivox VCF layout
Subject description: (currently unverified)
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The (quite popular) Polivoks filter, based on the schematic by M. Bareille. Uses programmable opamp ICs (uA776, NTE888, LM4250) and runs off +/-12V or +/-15V (not tested with lower voltages yet).

MOST RECENT VERSION:
http://www.2shared.com/file/pw5qsaqe/polivoks_updated.html

Old versions:
http://www.2shared.com/file/8sijvxp1/polivoks-vcf.html
(for information only)

Untested as of 12 Aug 2011. Feel free to try it out if you dare. Cheers Smile

Last edited by egasimus on Fri Aug 12, 2011 6:32 am; edited 5 times in total
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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Thu May 12, 2011 4:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fixed, I think. Now it's a bit smaller and has caps on the power rails (only 100uF electrolytics, though, didn't have room to shunt them with some 100nF ones or so). Little, if any, is left of the original abuse of curve tool, now replaced with abuse of diagonal traces. The component layout looks kinda prettier, it's fun making those:

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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Sebo



Joined: Apr 27, 2007
Posts: 541
Location: Argentina

PostPosted: Sun May 15, 2011 3:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you!!!
I will try it in a near future!!!

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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Sat May 21, 2011 3:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Note that there's too little clearance around the three square pads - I'll make some room (perhaps move the pot a little) and fix that, too, but until I do, take care not to short them Smile
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Sebo



Joined: Apr 27, 2007
Posts: 541
Location: Argentina

PostPosted: Sat May 21, 2011 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

OK, thank you!
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Fri May 27, 2011 3:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you add a 50k or 100k trimmer with the outer pins going to + and - and the middle pin to a 100k resistor and add that little circuit to the Main CV Line (where all the CV's mix or meet) you will make it work universal for all Voltage Power Formats. It will act as a Cutoff Range Offset.

It is worth the extra redesigning.
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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Mon May 30, 2011 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

That's exactly the kind of feedback I need Smile This will definitely go into the next revision.
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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Tue Jul 12, 2011 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Finally:
http://www.2shared.com/file/pw5qsaqe/polivoks_updated.html
Rolling Eyes
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Sebo



Joined: Apr 27, 2007
Posts: 541
Location: Argentina

PostPosted: Tue Jul 12, 2011 4:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.

Did you tested this version?

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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Thu Jul 14, 2011 9:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Nope, but a guy at another forum already volunteered, and I myself got the ICs today, so it might be verified soon.
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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
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PostPosted: Wed Aug 10, 2011 3:50 am    Post subject: Reply with quote  Mark this post and the followings unread

it looks pretty easy
any news? is it working? somebody tested?....
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egasimus



Joined: Feb 11, 2011
Posts: 112
Location: Bulgaria

PostPosted: Fri Aug 12, 2011 6:28 am    Post subject: Reply with quote  Mark this post and the followings unread

No :/ The guy who tried to build it only got so far, but I haven't heard from him for a while. I think he had some problems with the power supply - he's a guitar stompbox guy, just like me. I'm hopefully gonna build my own bipolar PSU soon, though, so I'll eventually get around to testing it. Sorry :/
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n.d



Joined: Dec 15, 2011
Posts: 22
Location: Argentina

PostPosted: Sun Jan 29, 2012 7:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi there. Any news? Sebo? Anyone?
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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
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PostPosted: Mon Jan 30, 2012 6:33 am    Post subject: Reply with quote  Mark this post and the followings unread

I start to think that the only solution is trying to etch a board and see if it work.....
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-minus-



Joined: Oct 26, 2008
Posts: 761

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PostPosted: Mon Jan 30, 2012 6:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Can someone actually upload an image without having to go through all the hassle of links to other sites and zip files please?

2Shared The Easiest Way To Share Files... clearly is NOT the easiest. I can't get the file to download at all. Laughing
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n.d



Joined: Dec 15, 2011
Posts: 22
Location: Argentina

PostPosted: Mon Jan 30, 2012 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, took me two hours to DL.
Here it is.


polivoks_updated.zip
 Description:

Download
 Filename:  polivoks_updated.zip
 Filesize:  143.08 KB
 Downloaded:  356 Time(s)

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n.d



Joined: Dec 15, 2011
Posts: 22
Location: Argentina

PostPosted: Mon Jan 30, 2012 12:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Please report back if you build it.
And egasimus, do you have the eagle - or kicad, altium, whatever- files?
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Sebo



Joined: Apr 27, 2007
Posts: 541
Location: Argentina

PostPosted: Tue Jan 31, 2012 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

I had the PCB etched for a while, but didn't had the time to solder anything yet...
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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
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PostPosted: Thu Feb 09, 2012 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

any news about this board??
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tokyomatik



Joined: Jan 20, 2011
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PostPosted: Thu Mar 08, 2012 7:14 am    Post subject: Reply with quote  Mark this post and the followings unread

....so???? Crying or Very sad
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Sebo



Joined: Apr 27, 2007
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Location: Argentina

PostPosted: Thu Mar 08, 2012 7:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I didn't do any advance Sad
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Sebo



Joined: Apr 27, 2007
Posts: 541
Location: Argentina

PostPosted: Sat Jun 02, 2012 6:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi:
I just finished my Polivoks VCF using this PCB and I can confirm it works.
I just did some mods to improve the cutoff range and the CV inputs sensitivity, but this mods are the same all people do to the Marc Bareille version.
Thanks again to egasimus for share!!!

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LFLab



Joined: Dec 17, 2009
Posts: 195
Location: Rosmalen, Netherlands

PostPosted: Mon Jun 04, 2012 3:05 am    Post subject: Reply with quote  Mark this post and the followings unread

I've etched a board for this thing, but haven't found time to assemble it into a module (and since I want it to be a dual, will need to etch another board).

What mods did you do to improve cutoff range and CV input sensitivity? Will need to see if I can change the layout slightly to incorporate the changes. Would also be nice to have a euro style power connector, since I have them on the bussboards in my cabinets, that's an easy enough addition.

Edit:
Did you tie the cutoff to V- with a resistor? That's also a mod for the SSM2044 VCF, helps tremendously.
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Sebo



Joined: Apr 27, 2007
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PostPosted: Mon Jun 04, 2012 8:28 am    Post subject: Reply with quote  Mark this post and the followings unread

To imporve cutoff range I wired the side of the cutoff pot that goes to ground to -15V instead. Also changed R8 to 270K and put a 50K trimpot in series to finetune (I think I ended with a total resistance of 290K aprox).
To improve the CV sensitivity I changed R5 and R9 to 150K.

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mrkva



Joined: Jan 25, 2012
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Location: poland/slovakia/netherlands

PostPosted: Wed Jan 30, 2013 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

How would one adjust this shematic for +/- 12V? Thank you
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