Hi Oscar,
Glad that is sorted out.
First of all we will attack the noise problem. This is a well documented
problem and there is a small error on the pcb which you need to look at (I
thought I had already advised you of this, but so many things happening
lately). Anyway, at one end of the board is a resistor and capacitor (R210
and C207). Turn the board so that they are nearest to you and the pots are
on your left. You need to desolder the right-hand leg of the resistor and
the left-hand leg of the capacitor and then join these 2 legs together in
mid air. This should resolve the noise problem.
Now for the other matter. Except for the error above, I have tried to stay
as close to Ken's circuit as possible. I would recommend a quick visit to
his website and pop in to the CGS35 module (not the CGS35E). Towards the end
of the page is some feedback from another customer who has made adjustments
to some of the values to improve the control. It would be worth studying
them and possibly trying them out. I have been so busy lately, especially
with getting the front panels for these modules organised, that I haven't
had any time to spend on other tasks. One of those tasks is to try out the
aforementioned changes and see how they work. If they do work as well as
indicated then I will be adapting the CGS735 circuit to suit. If you do
experiment with and get the results you expected then please let me know and
I will try and speed up the check at my end.
Best Regards
(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645
Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com
This e-mail and any files transmitted with it are confidential and intended
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or
otherwise use it, or any part of it, in any form whatsoever. If you have
received this e-mail in error please notify the sender and ensure that all
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence
of computer viruses, Elby Designs will not be liable for any losses as a
result of any viruses being passed on.
Glad that is sorted out.
First of all we will attack the noise problem. This is a well documented
problem and there is a small error on the pcb which you need to look at (I
thought I had already advised you of this, but so many things happening
lately). Anyway, at one end of the board is a resistor and capacitor (R210
and C207). Turn the board so that they are nearest to you and the pots are
on your left. You need to desolder the right-hand leg of the resistor and
the left-hand leg of the capacitor and then join these 2 legs together in
mid air. This should resolve the noise problem.
Now for the other matter. Except for the error above, I have tried to stay
as close to Ken's circuit as possible. I would recommend a quick visit to
his website and pop in to the CGS35 module (not the CGS35E). Towards the end
of the page is some feedback from another customer who has made adjustments
to some of the values to improve the control. It would be worth studying
them and possibly trying them out. I have been so busy lately, especially
with getting the front panels for these modules organised, that I haven't
had any time to spend on other tasks. One of those tasks is to try out the
aforementioned changes and see how they work. If they do work as well as
indicated then I will be adapting the CGS735 circuit to suit. If you do
experiment with and get the results you expected then please let me know and
I will try and speed up the check at my end.
Best Regards
(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645
Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com
This e-mail and any files transmitted with it are confidential and intended
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or
otherwise use it, or any part of it, in any form whatsoever. If you have
received this e-mail in error please notify the sender and ensure that all
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence
of computer viruses, Elby Designs will not be liable for any losses as a
result of any viruses being passed on.
----- Original Message -----
From: "osaiber" <osaiber@...>
To: <cgs_synth@yahoogroups.com>
Sent: Thursday, August 02, 2007 9:54 AM
Subject: [cgs_synth] Re: Test Calibration Synthacon filter Panther.
Thanks Laurie.
I saw that I made an error, I put the trimpot resistors in wrong
places. I have already fixed this.
I have been able to calibrate the filter, but the potentiometer of
frequency only covers from 40 hz to 1Khz. If I increase the trimpot,
I lose low frequencies, for example I can obtain from 100 hz to 2Khz.
Is it normal ? Can I obtain a wider range of frequencies?
Also i have noticed noise when I turn the resonance pot.
Is it normal?
Many thanks and Best Regards
--- In cgs_synth@yahoogroups.com, "Laurie Biddulph"
<elby_designs@...> wrote:
>
> Hello Oscar,
>
> Just a note for you and any CGS readers. The trimpot designators
you have
> used are from my schematics for the Panther version of the circuit.
Ken's
> circuits do not use these designators so you need to cross-
reference as
> follows:-
>
> CGS735 (Panther), CGS35E (CGS)
> P201, CV REJECT
> P202, RES TRIM
> P206, SPAN TRIM
>
> Best Regards
>
> (Mr) Laurie Biddulph
> Phone: +61 (0)2 4340 0938
> Mobile: 0400 257 645
>
> Elby Designs
> ABN: 70 022 727 605
> http://www.elby-designs.com
>
> This e-mail and any files transmitted with it are confidential and
intended
> for the addressee only.
> If you are not the addressee you may not copy, forward, disclose or
> otherwise use it, or any part of it, in any form whatsoever. If you
have
> received this e-mail in error please notify the sender and ensure
that all
> copies of this e-mail and any files transmitted with it are deleted.
> Any views or opinions represented in this e-mail are solely those
of the
> author and do not necessarily represent those of Elby Designs.
> Although this e-mail and its attachments have been scanned for the
presence
> of computer viruses, Elby Designs will not be liable for any losses
as a
> result of any viruses being passed on.
>
> ----- Original Message -----
> From: "osaiber" <osaiber@...>
> To: <cgs_synth@yahoogroups.com>
> Sent: Wednesday, August 01, 2007 10:06 AM
> Subject: [cgs_synth] Test Calibration Synthacon filter Panther.
>
>
> Hello!
>
> I'm newbie in DIY. I just have mounted three synthacon filters. All
> looks good.
>
> I read in the manual but I have not achieved to calibrate the
filters
> with the three trim resistors, P 206, P202 P201 .
>
> Can anybody explain in a detailed way how make it?
>
>
>
>
>
> Many Thanks in advance,
>
> ÈZscar.
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
The CGS Modular Synth home page: http://www.cgs.synth.net/
Yahoo! Groups Links