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CGS 40 - Modulo Magic

CGS 40 - Modulo Magic

2012-09-12 by Stephen Richards

Hi Ken

I have run into a problem , i am changing out the 100K resistors for the 560K and 470K and there are some conflicting pieces of information.

On the schematic the resistors are marked :

OFS and SS - 470K

REF - 560K

On the wiring diagram at the bottom of the page :

OFS and REF - 470K

SS - 560K

Which one is correct ?


Also , i have the earlier version of the CGS40 not the 1.2 Version.

Is the schematic any different ?

[Non-text portions of this message have been removed]

Re: CGS 40 - Modulo Magic

2012-09-12 by sasami@hotkey.net.au

>I have run into a problem , i am changing out the 100K resistors for the
560K and 470K and there are some conflicting pieces of information.

Schematic is incorrect. I'll fix it. Thanks for pointing it out.

Correct:

>OFS and REF - 470K
>
> SS - 560K

>Also , i have the earlier version of the CGS40 not the 1.2 Version.
>
>Is the schematic any different ?

Significantly, but the functionality is the same. The changes are in the
circuitry driving the switches, and the addition of stabilizing caps across
the op-amps.

Ken

_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: CGS 40 - Modulo Magic

2012-09-12 by Stephen Richards

Cheers Ken

Where is the best place to tap 'pos' and 'neg' busses from on that board ?


________________________________
Show quoted textHide quoted text
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Wednesday, September 12, 2012 1:20 PM
Subject: Re: [cgs_synth] CGS 40 - Modulo Magic



>I have run into a problem , i am changing out the 100K resistors for the
560K and 470K and there are some conflicting pieces of information.

Schematic is incorrect. I'll fix it. Thanks for pointing it out.

Correct:

>OFS and REF - 470K
>
> SS - 560K

>Also , i have the earlier version of the CGS40 not the 1.2 Version.
>
>Is the schematic any different ?

Significantly, but the functionality is the same. The changes are in the
circuitry driving the switches, and the addition of stabilizing caps across
the op-amps.

Ken

__________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>




[Non-text portions of this message have been removed]

Re: CGS 40 - Modulo Magic

2012-09-12 by Stephen Richards

A couple more questions.


There isn't a second OFS pad provided on this board. I've already used the OFS pad for OFFSET VC.
Where can i put the OFFSET Wiper connection ?

Also , there's no INIT STEP CV pad. Where is best to attach the INITIATION pot Wiper ?






________________________________
Show quoted textHide quoted text
From: Stephen Richards <okayjustalittle@...>
To: "cgs_synth@yahoogroups.com" <cgs_synth@yahoogroups.com>
Sent: Wednesday, September 12, 2012 1:37 PM
Subject: Re: [cgs_synth] CGS 40 - Modulo Magic





Cheers Ken

Where is the best place to tap 'pos' and 'neg' busses from on that board ?

________________________________
From: "sasami@..." <sasami@...>
To: cgs_synth@yahoogroups.com
Sent: Wednesday, September 12, 2012 1:20 PM
Subject: Re: [cgs_synth] CGS 40 - Modulo Magic



>I have run into a problem , i am changing out the 100K resistors for the
560K and 470K and there are some conflicting pieces of information.

Schematic is incorrect. I'll fix it. Thanks for pointing it out.

Correct:

>OFS and REF - 470K
>
> SS - 560K

>Also , i have the earlier version of the CGS40 not the 1.2 Version.
>
>Is the schematic any different ?

Significantly, but the functionality is the same. The changes are in the
circuitry driving the switches, and the addition of stabilizing caps across
the op-amps.

Ken

__________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

[Non-text portions of this message have been removed]




[Non-text portions of this message have been removed]

Re: CGS 40 - Modulo Magic

2012-09-12 by sasami@hotkey.net.au

>
>
>A couple more questions.
>
>
>There isn't a second OFS pad provided on this board. I've already used the
OFS pad for OFFSET VC.
>Where can i put the OFFSET Wiper connection ?

Through an external resistor to M1 - Look at the V1 documents linked from
the top of the page. http://www.cgs.synth.net/modules/cgs40v1_modulo_magic.html
All the relevant details are in that article, even if the wiring diagram
doesn't reference the BoCGS panel.

>
>Also , there's no INIT STEP CV pad. Where is best to attach the INITIATION
pot Wiper ?
>
>
>
>
>
>
>________________________________
> From: Stephen Richards <okayjustalittle@...>
>To: "cgs_synth@yahoogroups.com" <cgs_synth@yahoogroups.com>
>Sent: Wednesday, September 12, 2012 1:37 PM
>Subject: Re: [cgs_synth] CGS 40 - Modulo Magic
>
>
>Â
>
>
>Cheers Ken
>
>Where is the best place to tap 'pos' and 'neg' busses from on that board ?
>
>________________________________
>From: "sasami@..." <sasami@...>
>To: cgs_synth@yahoogroups.com
>Sent: Wednesday, September 12, 2012 1:20 PM
>Subject: Re: [cgs_synth] CGS 40 - Modulo Magic
>
>
>Â
>>I have run into a problem , i am changing out the 100K resistors for the
>560K and 470K and there are some conflicting pieces of information.
>
>Schematic is incorrect. I'll fix it. Thanks for pointing it out.
>
>Correct:
>
>>OFS and REF - 470K
>>
>>Â SSÂ - 560K
>
>>Also , i have the earlier version of the CGS40 not the 1.2 Version.
>>
>>Is the schematic any different ?
>
>Significantly, but the functionality is the same. The changes are in the
>circuitry driving the switches, and the addition of stabilizing caps across
>the op-amps.
>
>Ken
>
>__________________________________________________________
>Ken Stone sasami@... otherunicorn@...
>Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>[Non-text portions of this message have been removed]
>
>
>
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

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