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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
CGS49: twin wasp filter
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SOTS



Joined: Feb 15, 2010
Posts: 9
Location: Columbia, MO

PostPosted: Fri Apr 22, 2011 8:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

wiring the freq pot to the -VE helped immensely!!! much better than other way listed. it might just be perception, bit it seems like it's also helped even out the levels on the distortion. have not tried the resonance mod yet, but will post results when i get around to it.
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kupfer_m



Joined: Oct 14, 2010
Posts: 48
Location: Belgium

PostPosted: Sun Jun 05, 2011 12:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's mine!

I also wired the frequency pot to -V as documented on Ken's site.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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clarke68



Joined: Sep 10, 2009
Posts: 29
Location: Bay Area, CA

PostPosted: Wed Jun 15, 2011 6:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice work, kupfer_m, looks great!

Question for you: what kind of rotary switch is that? Looks to be nice and small behind the panel.
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kupfer_m



Joined: Oct 14, 2010
Posts: 48
Location: Belgium

PostPosted: Wed Jun 15, 2011 9:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!

The switch is not small at all, it just has a longer shaft so it extends
behind the potentiometers.
It's an old wafer switch that I had lying around.

Some have used this one
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clarke68



Joined: Sep 10, 2009
Posts: 29
Location: Bay Area, CA

PostPosted: Fri Jun 17, 2011 2:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you, very helpful!

How do you extend a rotary switch behind the pots? Even on the long shaft versions I've seen, the threads don't go far enough to mount the switch any place other than right against the panel. Would you mind showing a pic of the back of yours?

That mini-rotary switch, however, is awesome! Planning on using it in this design:


cgsMsuEuro.jpg
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ungleichklang



Joined: Dec 03, 2011
Posts: 84
Location: East-Belgium

PostPosted: Wed Oct 31, 2012 5:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

So, I just finished mine, did the RTFM-thingy on Ken's website and connected the frequency pot to +VE / -VE and added a 150K restistor in series ... as mention on the website Wink

I also tested the resonance modification and replaced the 33k resistor with a 10k resistor .. sounds fun ...

I still have to do some testing cause I think my build is not as clean as it should be ...... distortion% seems weak ....

@Ken:
I am 40, started soldering about 1 year ago and I don't understand a thing of electronic-circuits .. all stuff I do is because I love modular synths since I'm 14 ... to me building a modular synth is a challenge and a dream becoming true .. without guys like you, Yusynth, fonik, mfos or curetronic I never would have taken this ..
now you know what people you also deal with Wink
btw. even if I don't understand a thing I love your circuits

thanks for providing your schematics and boards ...

_________________
greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


Linux Musician
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