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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Digital Noise and 0.47u Electrolytic
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whomper



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PostPosted: Mon Dec 29, 2008 1:06 pm    Post subject: Digital Noise and 0.47u Electrolytic Reply with quote  Mark this post and the followings unread

Hi,

It the spec it states a 0.47uF electrolytic capacitor, but that beast is very rare (or did not exist to begin with...)

Is it a typo? Should I use a polyester film or some other substitute?

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Sine



Joined: Sep 10, 2007
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PostPosted: Mon Dec 29, 2008 1:25 pm    Post subject: Re: Digital Noise and 0.47u Electrolytic Reply with quote  Mark this post and the followings unread

Any .47uF cap will do there, I used a simple MKT cap
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Etaoin



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PostPosted: Thu Jan 01, 2009 12:09 pm    Post subject: Re: Digital Noise and 0.47u Electrolytic Reply with quote  Mark this post and the followings unread

whomper wrote:
(or did not exist to begin with...)


They do exist (I have one in mine), but indeed, any cap will do.

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Dave Kendall



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PostPosted: Sun Jan 04, 2009 5:01 pm    Post subject:
Subject description: Speed + added 2 x CV Mods
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Hi.

I did a Mod on mine that adds 2 CV inputs as well as the POT. This is cool when an initial setting is modulated by other added CVs. There is also an added MIN speed range switch (dual pole changeover toggle switch)
This lets the lowest speed go down to a series of slow gates, and with value at 680nF, the ranges overlap slightly at their extremes.

The top section can be easily made with a CGS04, wired straight in to the CV input. Mine was wired on a small piece of perfboard, and I think I used a 47K LIN pot. (compare the diagram with the original - it's a pretty simple mod, but adds greatly to the fun IMO Smile )

cheers,
Dave

EDITED. to correct pinout in diagram of 2nd section of CV mixer input.


cgs31_digital_noise_mod_EDIT_820.png
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cgs31_digital_noise_mod_EDIT_820.png



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Last edited by Dave Kendall on Wed Sep 22, 2010 4:44 pm; edited 1 time in total
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The Bad Producer



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PostPosted: Wed Sep 22, 2010 3:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just built this, adding the mod above...

I found out that there is an error on the above schematic, in the second half of the op-amp pins 5 and 6 are the wrong way round...

Refer to Kens schemo here for correct version...

http://www.cgs.synth.net/modules/cgs04_mix.html

Anyway, these are both great mods! (the cap and the input mixer..)

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Dave Kendall



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PostPosted: Wed Sep 22, 2010 4:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oops... well caught that man.... Schemo now corrected.
Glad you like the mods Smile

Got mine to fit behind a homebrew 6HP eurorack panel with 1 pot, toggle switch below, and eight 3.5mm jacks below that.

cheers,
Dave

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