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 Forum index » DIY Hardware and Software
Polivoks filter
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crashlander42



Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)

PostPosted: Sun Aug 31, 2008 12:58 am    Post subject: Polivoks filter Reply with quote  Mark this post and the followings unread

I breadboarded the Polivoks filter tonight using the schematic form http://m.bareille.free.fr

I like it a lot. It reminds me of the MS20 filter clone with the input gain turned down, but when you turn the input gain up there's magic. It turns into a nasty evil distorted beast. It has that crazy squelchy resonance that the MS20 dies when it's turned to max. I'm definitely putting this together on veroboard tomorrow.

Here's a video of my trial run. I crank the gain about 1/3 of the way through and crank the resonance at the end.

http://www.youtube.com/watch?v=3ZypalMfkFI

I'm curious if anyone else has built this and if theirs sounds similar. I used the UA776 and UA741 in mine, if that makes any difference

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Funky40



Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5

PostPosted: Sun Aug 31, 2008 4:31 am    Post subject: Reply with quote  Mark this post and the followings unread

it sounds good your one.
I think better than my one. But i have unfortunately no input attenuation which is higly recommended.
Then it's also recommended to build with The UA776 ( i just know this, never got the LM4250. but everybody who has compared them says the same )

and i then would recommend to build it with a Outputmixer stage,
but this might be a thing of personal taste.
I use my Polivoks mostly in BP mode, but mix sometimes some LP to it.
But sometimes when jamming with a sound i twiddle around with the mixer.
so i have allways a mixer next to the Polivoks and the polivoks patched by default to it

shit, i shoulda make a friendship with the Breadbord too.
Nice setup you have !

check good the Range of the CV input pots if you have not.
they may need some adjustment. On my filter it is really bad.


edit:
my old thread:
http://www.electro-music.com/forum/topic-13248.html
the demo is made without any input attenuation.
the module on the left is akllways in use. THATS my polivoksfilter Laughing
the one on the right is in frac format, but i have no fracrac still today Laughing
I'm on the way to repanel them. i make a dual Polivoksfilter.
But i'm not shure if i should make a new panel as i have allready more Ideas.
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crashlander42



Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)

PostPosted: Mon Sep 01, 2008 12:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I lucked out on the UA776's. My local surplus store had some. I used attenuators on my inputs, which makes a huge difference. It also amazes me the range of different tones you can get just from adjusting your input levels.


I like your layouts. The bandpass filter on this thing sounds awesome. I have plenty of mixers, so I didn't do an output mixer. I nearly gave it the same panel I did for the MS20 clone.

Here's my panel. I know it's a little jagged, but I cut it with a jigsaw. I need to get to a table saw to cut some more blank panels.

Here's a picture of the vectorboarded (stripboard, veroboard, whatever it's called) Polivoks as well. I was pretty pleased with my work. Very Happy


polivoks.jpg
 Description:
Here's my Polivoks panel. I know it's a little jagged, but I cut it with a jigsaw. I need to get to a table saw to cut some more blank panels.
 Filesize:  95.74 KB
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polivoks.jpg



polivoks stripboard.jpg
 Description:
Here's a picture of the vectorboarded (stripboard, veroboard, whatever it's called) Polivoks as well. I was pretty pleased with my work. :D
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polivoks stripboard.jpg



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Funky40



Joined: Sep 24, 2005
Posts: 875
Location: Swiss
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PostPosted: Mon Sep 01, 2008 2:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

crashlander42 wrote:
I lucked out on the UA776's. My local surplus store had some. I used attenuators on my inputs, which makes a huge difference. It also amazes me the range of different tones you can get just from adjusting your input levels.

I had also the Polivoks filter from the harvestman.
That one had not the required inputgain ( but it is constructed after and with the original Polivoks constructeur Vladimir cuzmin afair )
Funny, they do the same faults on analog Modular as on software: ---> just cloning.
It must sound good ! Who needs a clone ?

btw.: i use the polivoksfilter especially also to accentuate metallic timbres in the sounds. ----> BBD sounds Very Happy
nothing i know that rivals the polivoksfilter in that, and also in others.


i like your style of building modules very much !
I had planned to build also with acrylglas, but never got some. But i will do.
My panels are btw. also made with the Jigsaw. i build mostly in wood, but now with printed covers

my panels in work, on top left the dual polivoksfilter panel


IMG_0125.JPG
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on top lefgt my new deual polivoksfilter panel
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ENDIF



Joined: Jul 14, 2006
Posts: 138
Location: Reno, NV

PostPosted: Fri Sep 05, 2008 12:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I haven't finished my M.Bareile pcb, but I did buy the Harvestman clone.. naaasty. >=]
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haxster



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

PostPosted: Sun Dec 07, 2008 4:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

I recently have been fooing around with this design. Here is a schematic of the values i used and how i fixed the cutoff problem.

http://electro-music.com/forum/viewtopic.php?highlight=polivoks&t=23246

I have designed a new Pro PCB. I just need to make sure it is 100% error free. It is to arrive 2 week of December 2008. It is self powered, more like an external modular unit.
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davebr



Joined: Jun 09, 2007
Posts: 198
Location: portland, or

PostPosted: Thu Feb 21, 2013 3:34 pm    Post subject: Polivoks Filter Reply with quote  Mark this post and the followings unread

I just finished building a Polivoks filter also. I chose to wire it by hand and grabbed whatever perfboard I had in the drawer. Then I found this forum posting and found by coincidence we had built them on the same perfboard. I just thought that fact was interesting. I'm still waiting for my front panel to finish the module. I did a lot of comparisons between the NTE888M and TL071 op-amps and the 2N3904 transistor and the Russian УД1208 and KP140УД85 op-amps and the KT315Г transistor. I also implemented a few mods including 1V/octave tracking and changes to the self-oscillation waveform.

[EDIT - I got some uA776 parts and added a comparison of those as well as a couple of videos and sound samples to my Polivoks filter page.]

My Polivoks page is at http://modularsynthesis.com/kuzmin/polivoks/polivoks_vcf.htm

Dave
crashlander42 wrote:
Here's a picture of the vectorboarded (stripboard, veroboard, whatever it's called) Polivoks as well. I was pretty pleased with my work. Very Happy



djb-polivoks_perfboard.jpg
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My perfboard design
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