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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
cgs35 Steiner filter advice - version 1
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Nikmis



Joined: Dec 12, 2006
Posts: 5
Location: Canada/Japan

PostPosted: Mon Mar 19, 2012 5:38 pm    Post subject: cgs35 Steiner filter advice - version 1 Reply with quote  Mark this post and the followings unread

I built one of the version1 pcbs this week. I bought two pcbs years ago and made one that worked fine. But this time around its is giving me a really hard time. It filters on all three inputs, but the output is too quiet. But the moment I turn the resonance knob past 10 o'clock, it just goes into psychotic uncontrollable resonance that is definitely not quiet. I have been searching around different forums and have seen two topics with the same problem, but there was no responses that helped. I assume it must be a transistor problem, like I wired one in backwards, but not according to the schematic or pcb.

Any ideas? This circuit is nothing new, I bet someone knows this problem
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Wed Mar 21, 2012 8:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

The steiner is the only board I've ever given up on. I tried everything I could think of, but never could get the darned thing to work. Fortunately there aren't any expensive parts on it, so I just cut the pots and jacks loose and wrote it off as a bad job.

I hope your luck is better than mine.

Gary
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forshee



Joined: Dec 16, 2010
Posts: 46
Location: Hopkins, MN

PostPosted: Fri Mar 23, 2012 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'd make sure the transistors have the same pin outs as on the board. It's a pretty simple circuit shouldn't be that hard to figure out. I had one bad board from Ken out of maybe 30 but it can't hurt to check the traces as well.
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