CGS49: twin wasp filter

fluxmonkey · Joined: Jun 24, 2005 Posts: 708 Location: cleve

i haven't ordered mine yet, so at the risk of finding them sold out by the time i do:

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.

http://www.cgs.synth.net/modules/cgs49_twf.html

"This board containts two independant VCFs based on the popular CMOS based Wasp VCF, In adition it also features adjustable post-filter distortion.
Distortion channel is based on Jurgen Haible's design. Filter originally by Chris Huggett."

THANKS, KEN!!!

bbob

zthee · Joined: Feb 20, 2008 Posts: 414 Location: Stockholm

The first one who builds it need to put up samples! Very Happy

I think I'm gonna build one.
But I think having all the individual outputs on the front panel and then a few extra inputs could be fun - for example; feedback from BP to input and then LP to distortion to next filter and then feedback again Smile

synthmonger · Posted: Fri Apr 24, 2009 12:01 pm Post subject:

Funny, I was checking his site last night hopeing he'd come out with something new. What a nice surprise today!

vtl5c3 · Posted: Mon Apr 27, 2009 5:04 pm Post subject:

So, I think to get 'Divergence', as in Cynthia's wasp filter, you simply push the same CV into one of the filter's positive CV inputs and simultaneously into the other filter's negative CV in. Gonna have to try that when I build the unit.

R.

Fernando · Posted: Mon Jul 27, 2009 12:01 pm Post subject:

Hi Romeo, one could also use Ken's CV Cluster for "VC Divergence" (with this dual filter, any two filters or any two devices, of course)

TekniK · Joined: Aug 10, 2008 Posts: 1059

Anyone did built this one with successfull results?

andrewF · Posted: Sun May 09, 2010 3:38 am Post subject:

just the filter?
yes -no worries

TekniK · Joined: Aug 10, 2008 Posts: 1059

andrewF · Posted: Sun May 09, 2010 8:12 am Post subject:

TekniK · Joined: Aug 10, 2008 Posts: 1059

Ah,ok,hmm well mine everythings seems ok just the filter stay open ,cutoff offset

andrewF · Posted: Sun May 09, 2010 4:18 pm Post subject:

try wiring the freq pots between +/-V rather than +V/Gnd

TekniK · Joined: Aug 10, 2008 Posts: 1059

numbertalk · Posted: Mon May 10, 2010 5:54 am Post subject:

TekniK · Joined: Aug 10, 2008 Posts: 1059

numbertalk · Posted: Mon May 10, 2010 7:25 am Post subject:

TekniK · Joined: Aug 10, 2008 Posts: 1059

ok, thanks both for help.

Its ok now,but i think the add on board is the offsets for the cutoff because straight +/-V gives unbalance in the cuttoff pot.

Stone should mention all these fixes on his site,now hes selling not proper working kits. Confused

otherunicorn · Joined: May 11, 2008 Posts: 136 Location: Australia

Scott Stites · Posted: Tue May 18, 2010 7:20 am Post subject:

TekniK · Joined: Aug 10, 2008 Posts: 1059

Its not a build problem,its a factory circuit design problem that luckly can be resolved due to helping forum members.

Its a fact,i don't get what u try do defend here.

Scott Stites · Posted: Tue May 18, 2010 10:37 am Post subject:

Feel free to debate my intelligence (you did not have to delete that part of your original post); I believe attempting any fruitful conversation with you is evidence that it should be called into question.

You should, however, understand Ken Stone is not a "factory". Others on this topic have working modules using the PCB (not kit) Ken supplied. If you have problems, you ask questions and resolve them. You crack a book. You learn. You do it yourself.

hottlungs · Joined: Feb 16, 2011 Posts: 11 Location: long beach, ca

What connection would you make to the ccw position of the potentiometer in place of gnd to wire it between +/-V?

otherunicorn · Joined: May 11, 2008 Posts: 136 Location: Australia

hottlungs · Joined: Feb 16, 2011 Posts: 11 Location: long beach, ca

that definitely did the trick. thank you for your help.

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

just finished mine and had a few questions:
(FYI: i'm running on -/+12 volt)

-for the freq pot wiring to -VE, is it okay to wire it up to the point right after the ferrite bead that connects to the -15v connection? if not, what's the best point in reference to the scheme?

-distortion: the volume decreases and seems to get less distorted (possibly just perception due to volume drop) as i turn it clockwise. was wondering if this is normal.

- does anyone know how to increase the resonance? it doesn't seem very responsive. i really like the FAT sound i can get from my MFOS sound lab ultimate filter's res knob and was wondering if there was a way to do this. [/b]

otherunicorn · Joined: May 11, 2008 Posts: 136 Location: Australia