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 Forum index » DIY Hardware and Software » The layout factory
MS20 LPF clone cutoff
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palmiarz



Joined: May 22, 2019
Posts: 7
Location: Poland

PostPosted: Fri Jul 19, 2019 4:45 am    Post subject: MS20 LPF clone cutoff
Subject description: problem with cutoff
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Hello! I have a problem with MS20 lpf clone from Look Mum no Computer https://static1.squarespace.com/static/5912db7ee6f2e1435dbab4fd/t/5be83649f950b776709434cc/1541944936737/MS20+filter+stripboard+layout?fbclid=IwAR15jZssS-iknvwsfbrYAsA4IiNHQOdJthgAJ38KGhbb9rkjtLrnofTtr3M When I switch on this filter, all is ok, but after 5 seconds sound becomes a little smoothy and cutoff begins working as volume control. My voltage is +/-9v. Does anyone know what's wrong?
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wackelpeter



Joined: May 05, 2013
Posts: 461
Location: germany
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PostPosted: Sun Jul 21, 2019 1:57 am    Post subject: Reply with quote  Mark this post and the followings unread

can you post some Images of the top and Bottom side of your PCB with a good Resolution?
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Sun Jul 21, 2019 12:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Did you connect all three connectors to ground? In the comment it just says that the black wire etc. but the input jack at the lower left site has no black wire so that may be confusing.
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palmiarz



Joined: May 22, 2019
Posts: 7
Location: Poland

PostPosted: Mon Jul 22, 2019 1:09 am    Post subject: Reply with quote  Mark this post and the followings unread

wackelpeter wrote:
can you post some Images of the top and Bottom side of your PCB with a good Resolution?

It's soldering on universal board Smile
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palmiarz



Joined: May 22, 2019
Posts: 7
Location: Poland

PostPosted: Mon Jul 22, 2019 1:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Grumble wrote:
Did you connect all three connectors to ground? In the comment it just says that the black wire etc. but the input jack at the lower left site has no black wire so that may be confusing.

Yes, I did it.
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wackelpeter



Joined: May 05, 2013
Posts: 461
Location: germany
Audio files: 10

PostPosted: Mon Jul 22, 2019 7:20 am    Post subject: Reply with quote  Mark this post and the followings unread

palmiarz wrote:
wackelpeter wrote:
can you post some Images of the top and Bottom side of your PCB with a good Resolution?

It's soldering on universal board Smile


doesn't matter, just post it, so that People can see and give some Feedback if everything Looks okay or if they see something suspect.

Posting a link to the shcematics/build guide used is Always a good idea but additional Pictures of the board are the cherry on top of the cake. Wink

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palmiarz



Joined: May 22, 2019
Posts: 7
Location: Poland

PostPosted: Fri Jul 26, 2019 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, I found a problem - cold solder on transistors. Thanks for replies!
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