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 Forum index » DIY Hardware and Software » The layout factory
EFM VCF 4622 Moog Taurus type Transistor Ladder
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jbeuckm



Joined: Nov 30, 2008
Posts: 104
Location: minneapolis
Audio files: 8

PostPosted: Tue Dec 08, 2015 10:32 pm    Post subject: EFM VCF 4622 Moog Taurus type Transistor Ladder Reply with quote  Mark this post and the followings unread

This layout is verified. The cutoff pot should be connected to -12v instead of ground to completely close the filter.

Files: https://github.com/jbeuckm/EFM_VCF_4622

(image updated with the fix now)

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



Joined: Dec 13, 2009
Posts: 815
Location: Israel
Audio files: 18

PostPosted: Mon Dec 14, 2015 11:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you vey much Smile
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Sebo



Joined: Apr 27, 2007
Posts: 547
Location: Argentina

PostPosted: Sun Dec 27, 2015 10:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for sharing!!!
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isak



Joined: Dec 13, 2009
Posts: 815
Location: Israel
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PostPosted: Mon Jan 04, 2016 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi jbeuckm.

Did you built this board?
I found an intetesting post about the 4622:
http://electro-music.com/forum/topic-26994-0.html&postdays=0&postorder=asc&highlight=
Maybe it will be worth checking Wink

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jbeuckm



Joined: Nov 30, 2008
Posts: 104
Location: minneapolis
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PostPosted: Mon Jan 04, 2016 9:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I built one to test the general layout, but the one on Github is modified a lot since then. It worked, but the early layout needed a kludge to get -12v to the freq pot. I need to verify the newer version soon.
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isak



Joined: Dec 13, 2009
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PostPosted: Mon Jan 04, 2016 9:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Let me know how it went Smile
Cheers Smile

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jbeuckm



Joined: Nov 30, 2008
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Location: minneapolis
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PostPosted: Sat Jan 16, 2016 2:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Latest version v0.2 works. I fixed the -12V frequency pot thing, moved things around some and moved the CV+Q+F pots slightly further apart so they aren't jammed in.


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LFLab



Joined: Dec 17, 2009
Posts: 281
Location: Rosmalen, Netherlands

PostPosted: Sat Jan 23, 2016 2:09 am    Post subject: Reply with quote  Mark this post and the followings unread

While at lunch break the other day, I added the Taurus VCA to this (you still have another ota in the lm13700).
I have a github account, just can't figure out how to create repositories for my stuff. Will share when i can get github going.
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bamboombaps



Joined: Oct 23, 2015
Posts: 31
Location: Glasgow

PostPosted: Mon Jan 25, 2016 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

let me know when you do id like to have a look
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jbeuckm



Joined: Nov 30, 2008
Posts: 104
Location: minneapolis
Audio files: 8

PostPosted: Mon Jan 25, 2016 8:34 am    Post subject: Reply with quote  Mark this post and the followings unread

LFLab - that would be excellent. Git has a learning curve but it's the perfect way to work on this stuff. Here is a good way to proceed with your addon:

-- Log in to Github.

-- Go to my repository and "fork" it. This makes a copy into your Github account. There is a "fork" button in the upper right of the Github page.

-- "Clone" the new repository onto your computer. This requires some kind of Git client software - you might use Github's client or install the command line version of Git (I show some example command lines below).

[git clone git@github.com:lflab/EFM_VCF_4622.git]

-- Overwrite the downloaded schematic and board files with your new ones.

-- "Commit" the new files with Git, adding a message to describe the changes.

[git commit -a -m "added Taurus VCA"]

-- "Push" back up to Github to publish your results.

[git push origin master]

At that point your Github account will hold the updated version. If you wanted to, you could submit a "pull request" to tell me (publisher of the original repo that you forked) that your update is ready to incorporate into the original repo.

Here is a helpful Git tutorial: https://try.github.io/levels/1/challenges/1
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LFLab



Joined: Dec 17, 2009
Posts: 281
Location: Rosmalen, Netherlands

PostPosted: Wed Jan 27, 2016 1:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh, I'd already created my own Github repo's.
I installed Github Desktop, and if I open a repo, I can see the contents, but I can't seem to be able to publish them, I get a "failed to sync" error, saying that the repo needs to be debugged. To be honest, it could be the firewall I am behind at work, I'll take my pc home and retry.
But I am staying away from commandlines and such, if there's something handy as dropbox, which works great (I do appreciate revision control, it's a major part of my work, but for small projects like this, well, maybe it's more trouble than it's worth).
This is what I have now:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Double sided, the red dotted outline is a ground plane (it shows fully red after pressing the rats nest button, but I find that's not helpful when checking the routing)
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jbeuckm



Joined: Nov 30, 2008
Posts: 104
Location: minneapolis
Audio files: 8

PostPosted: Thu Jan 28, 2016 8:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool LFLab!

Warning: I drew the Erthenvar jacks and they are not tested for manufacturing. I would like to have used slots, but I use overlapping holes because that's what the "pcbgcode" ULP can handle and it works on my CNC router.
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LFLab



Joined: Dec 17, 2009
Posts: 281
Location: Rosmalen, Netherlands

PostPosted: Fri Jan 29, 2016 1:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, those slots did have me wondering, and I don't think iTEAD allows milling contours, figured I can always take a needle file and open up the two holes.
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jbeuckm



Joined: Nov 30, 2008
Posts: 104
Location: minneapolis
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PostPosted: Fri Jan 29, 2016 7:18 am    Post subject: Reply with quote  Mark this post and the followings unread

If they do allow overlapping holes, these three work perfectly well with no manual adjustment.

I tried to overlap .04" holes but kept breaking the bit, so these are .052
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