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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Serge ÷N COM
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agustindead



Joined: Jul 22, 2015
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PostPosted: Mon May 29, 2017 11:47 am    Post subject: Serge ÷N COM
Subject description: Trying to make sense of CGS' Voltage Controlled Divider
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Hi, I've been craving for some time a ÷N COM and wanted to know if Ken Stone's Voltage Controlled Divider is a) the same circuit; b) could be used to perform like a ÷N COM.

Here's CGS' Voltage Controlled Divider https://cgs.synth.net/modules/cgs09_vcd.html and here a picture of Random*Source ÷N COM for reference: Posted Image, might have been reduced in size. Click Image to view fullscreen.

I guess, to match the R*S design, the CV IN jack should not be connected to +15v, but instead the +15v should be mixed through an attenuator with the CV IN voltage.

What I don't understand much is the comparator section... (WAIT, is there really one that could work with a range of input voltages????) Does the MOUT in CGS design act as the comparator output?? If so, does the CMP pot act as the -5/+5 comparator level pot on R*S module? Same goes for the M-IN... is that the negative input for the comparator?

Thanks!
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agustindead



Joined: Jul 22, 2015
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PostPosted: Mon May 29, 2017 12:54 pm    Post subject: Re: Serge ÷N COM
Subject description: Trying to make sense of CGS' Voltage Controlled Divider
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Well, I guess the MOUT is definitely not similar to the comparator output in the ÷N COM... is there some way to get something similar out of the CGS design? Or is the comparator there just used to get a square wave out of the input to drive the rest of the module?

I'd like to get into some logic modules but it's still hard to grasp for me Confused
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JeanFé



Joined: Feb 03, 2013
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PostPosted: Mon May 29, 2017 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello, I was just wondering the same the other day...
VC and IN+ pots are indeed attenuators to +15V.
Comparator output is MOUT on board, and offset is labelled to be -/+5v on the panel of Best of CGS BOG (http://www.elby-designs.com/webtek/cgs/bocgs/bocgs-bog/bestofcgs-bog.pdf), but please let us know if you have to actually change 6.8k resistors values
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agustindead



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PostPosted: Mon May 29, 2017 1:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

JeanFé wrote:
Hello, I was just wondering the same the other day...
VC and IN+ pots are indeed attenuators to +15V.
Comparator output is MOUT on board, and offset is labelled to be -/+5v on the panel of Best of CGS BOG (http://www.elby-designs.com/webtek/cgs/bocgs/bocgs-bog/bestofcgs-bog.pdf), but please let us know if you have to actually change 6.8k resistors values


Oh, thanks for that link. That really clears some things up. I'll try making a build with the comp out wired to MOUT then. Smile

And for the 6k8 resistors, I'll be using 5k6... the math for a 12v power supply gives 5.44k so I guess 5k6 will be fine, or the closest 1% value.
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Fernando



Joined: Dec 30, 2006
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PostPosted: Sat Sep 30, 2017 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

JeanFé wrote:
Hello, I was just wondering the same the other day...
(...) Comparator output is MOUT on board, (...)


well, looking at the schematic, MOUT is a mixer (pre-comparator) output

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