[BUILD] God's Box 'Humpback' - 8hp Eurorack Multimode VCF

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StrangeAttraction
Common Wiggler
Posts: 189
Joined: Sun Nov 16, 2014 1:51 pm
Location: London

Re: [BUILD] God's Box 'Humpback' - 8hp Eurorack Multimode VCF

Post by StrangeAttraction » Tue Feb 11, 2020 7:21 am

Hi,
Hope you can help.

I bought a some-dude-built version of the Humpback and it's been working fine for a while...until quite recently when it developed issues.
In short, the filter appears to be stuck in a high resonance setting, in that unstable Waspy territory.
I've made a video showing this odd behaviour. Below are the screenshots of the build.

The only thing about the build that looks off to me is that piece of wire connecting 10uF capacitor with a solder in the last picture (shown with a yellow arrow).
Don't know why it's there, but it's been there while the module was working fine.
Any suggestions on what the issue might be?


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cnicht
Veteran Wiggler
Posts: 569
Joined: Mon Sep 23, 2013 9:23 am

Re: [BUILD] God's Box 'Humpback' - 8hp Eurorack Multimode VCF

Post by cnicht » Tue Feb 11, 2020 7:50 am

It's probable that the wire link was put in because of a broken track.

There seems be some poor soldering of the long board to board connector by the power connector, worth going over the joints with a little more solder.

Also try removing the black jumper from the back of the board it may tame the resonance, I do not have it placed on my two.

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