[sdiy] advice on mixer/summer circuits

[Dan Snazelle]

i am building a very large custom fx/synth/noisemaker thing for a friend. i am going to be mixing a vco, a ring mod, an audio input, and a few other things...this is all going into the audio input of an ssm2044.

(all mixing will be done pre-filter)

I will also be using a CV summer for all the cv signals that will be going into the A/R, VCO, LFO, VCA, AND FILTER.


SO...first question-why are all the good mixers Inverting? doesnt that mean i would need to put inverted audio into the mixer? is there an easy way around this other than sticking an inverter after the mixer? (which is what i will most likely do...is a 40106 ok for this?


thanks all






--------------------------------------------
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http://www.myspace.com/lossnyc


http://www.soundclick.com/lossnyc.htm


http://www.indie911.com/dan-snazelle
(or for techno) http://www.myspace.com/snazelle


> Date: Sun, 27 Jul 2008 09:46:18 -0500
> From: marksmartus at gmail.com
> To: Synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] WTB:SAD512 chips
> CC:
>
> I believe I read that SAD1024 chips can be used in an ARP Omni 2
> chorus board. The particular type of SAD512s used in the Omni 2 have
> the same pinout as an SAD1024 with only one of the halves wired up.
> Apparently, there were some SAD1024s that were manufactured with flaws
> that disabled one of the delay lines. So they wired whichever delay
> line was working to one set of pins and called it an SAD512! There are
> also different SAD512s that have fewer pins.
>
> Someone correct me if I'm wrong. I remember reading this somewhere,
> maybe on this list.
>
> So if you are building an Omni 2 chorus board from scratch, then you
> can probably use small-package SAD512s or SAD1024s in place of the
> large-package SAD512s and it will still work.
>
> If you are building one from scratch, but are using exactly the same
> layout as the original Omni board, then you can use either
> large-package SAD512s or SAD1024s.
>
> --
> Mark Smart
> http://cdbaby.com/cd/marksmart
> http://www.marksmart.net
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