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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
CGS49: twin wasp filter with bridechamber front pannel
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hottlungs



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

PostPosted: Wed Feb 16, 2011 10:42 am    Post subject: CGS49: twin wasp filter with bridechamber front pannel Reply with quote  Mark this post and the followings unread

The Bridechamber pannel has parameters for cv spread and consoidates the amount of cv inputs by using a switch to select positive and negative cv. I am trying to confirm the wiring from the freq cv input to the switch and from the switch to the freq cv pot & pcb(cv+ and -cv). Would i invert using a dpdt wired:

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

Any clarification would really help me.
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echoer



Joined: Dec 10, 2009
Posts: 40
Location: lawrence, ks

PostPosted: Sat Feb 26, 2011 6:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

The wiring for this module has me stumped as well. Not only with the "CV Invert" switches but with the "Spread CV" pot as well. I love the Bridechamber panels but I wish there was better documentation when it comes to implementing Scott's modifications. I will keep my eyes on this thread.
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echoer



Joined: Dec 10, 2009
Posts: 40
Location: lawrence, ks

PostPosted: Sat Feb 26, 2011 7:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just found some good info on muffwiggler.

http://www.muffwiggler.com/forum/topic-14390.html&highlight=wasp+filter+spread

Haven't tried any of this yet. Still wrapping my head around it...

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hottlungs



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

PostPosted: Mon Feb 28, 2011 6:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

I emailed Scott from the bride chamber and he was very helpful. I just forgot to have him elaborate on the switch because i thought i had it running.

"Hi Dan,

Sorry for the lack of documentation on that. You use the switch for the inversion of the CV. The spread pot is an attenuator (100k is good) for the spread jack. From the wiper of the pot, send one wire to CVSN on filter A via a 100k resistor, and one to the junction of the 100k, 2k2 and pin 3 of that TL072 (where the negative CV is going) of filter B. This will apply the spread voltage positively to filter A and negatively to filter B.

Thanks!
Scott Deyo"
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hottlungs



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

PostPosted: Tue Mar 08, 2011 4:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

I tried wiring spdt switches to switch between +/- cv. I have not adjusted the trimmers. I am only getting a response from the distortion potentiometers in LP or Notch mode on filters A and B. BP and HP modes are not outputting anything for either filter and the frequency and resonance controls do not affect the sound. I haven't been able to test the cv inputs. I am posting a picture of my wiring diagram

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

the picture contains the 9 potentiometers, 2 rotary switches, 2 spdt switches and 7 1/4" jacks from the rear. I have checked the components and made sure that i installed all of the links. photos of the unit to follow.
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hottlungs



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

PostPosted: Tue Mar 22, 2011 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Left PCB
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Right PCB
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Middle PCB
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Bottom Left
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Bottom Middle
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Bottom Right
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Top Left
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Top Middle
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Top Right
Posted Image, might have been reduced in size. Click Image to view fullscreen.
PANEL AND PCB
I replaced BC547 with 2N3904 and BC557 with 2N3906 which is why the transistors are oriented backwards on the PCB. power supplied by synthesizers.com power supply.

I am only getting a response from the distortion potentiometers in LP or Notch mode on filters A and B. BP and HP modes are not outputting anything for either filter and the frequency and resonance controls do not effect the sound. Any advice is appreciated.
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hottlungs



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

PostPosted: Thu Mar 24, 2011 3:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

I took some advice and wired the frequency pots +V and -V instead of +V and Gnd. The filter works fine now. I'm going to experiment with limiting the range of the frequency pots.
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