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Brain Freeze (CGS04 DC Mixer Question)

Brain Freeze (CGS04 DC Mixer Question)

2008-08-12 by thomas white

Hi folks,

Just having a bit of a probably useless brain freeze
here. I am building a Triple-VCO unit where I am using
a CGS04 DC Mixer to mix down the 3 VCO outputs into
one main output. The VCO's (LM566 Thomas Henry ones)
can also be run at LFO speed.

I don't anticipate any problem, but is there any
reason the DC mixer would interfere with this plan? It
is a non-inverting mixer that is meant to "preserve
the DC component" so I don't think so. This is a big
build so I want to get it right. Thanks!

Thomas (Excited about a triple Tri-Core VCO project)


Thomas White
Natural Rhythm
www.naturalrhythmmusic.com

Re: Brain Freeze (CGS04 DC Mixer Question)

2008-08-12 by sasami@hotkey.net.au

I can see no issues.

Ken

>Hi folks,
>
>Just having a bit of a probably useless brain freeze
>here. I am building a Triple-VCO unit where I am using
>a CGS04 DC Mixer to mix down the 3 VCO outputs into
>one main output. The VCO's (LM566 Thomas Henry ones)
>can also be run at LFO speed.
>
>I don't anticipate any problem, but is there any
>reason the DC mixer would interfere with this plan? It
>is a non-inverting mixer that is meant to "preserve
>the DC component" so I don't think so. This is a big
>build so I want to get it right. Thanks!
>
>Thomas (Excited about a triple Tri-Core VCO project)
>
>
>Thomas White
> Natural Rhythm
>www.naturalrhythmmusic.com
>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Brain Freeze (CGS04 DC Mixer Question)

2008-08-15 by Andre Majorel

On 2008-08-12 10:48 -0700, thomas white wrote:
Show quoted textHide quoted text
> Just having a bit of a probably useless brain freeze here. I am
> building a Triple-VCO unit where I am using a CGS04 DC Mixer to
> mix down the 3 VCO outputs into one main output. [...] I don't
> anticipate any problem, but is there any reason the DC mixer
> would interfere with this plan?

The only thing is that, whether or not the mixer is DC-coupled,
you might want to to keep the maximum gain below unity or, when
sync'ed, the oscillators will drive the mixing op amp into
clipping or reversal (3 x 5 V > 11 V).

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.

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