[sdiy] Which programable chip?

[Roy J. Tellason]

On Wednesday 15 April 2009 04:34:52 pm Scott Nordlund wrote:
> Why would you need to run the audio through the processor?
>
> If I'm not mistaken, are you wanting to route one input (of 8 total) to one
> output (of 8 total)?  You can do that with 2 4051 multiplexers, and not
> have to worry about any ADCs or DACs or high speed processors or anything. 
> You only need to send 6 bits to control everything.
>
> And if you want to be able to route multiple signals simultaneously, it may
> be slightly more complicated (depending on whether you want arbitrary
> routings, etc.)- you may need a crosspoint matrix, even 16 4066 chips (or
> similar), but it's the same basic idea to use analog switches to do the
> work.


Speaking of which,  I've had some idle thoughts now and then about running 
signals through those parts.  But you need to worry about signal levels,  and 
they probably oughta be kept fairly low,  not typical synth levels,  but more 
like "line" level as I understand it.  And if you want to use those parts 
with their 15V maximum supply voltage and a zero-centric signal level without 
AC coupling you'll need a pair of 7.5V supplies,  right?

Have any of you guys done much with this sort of thing?

I'm thinking some signal switching hardware would be a good thing to have...

> ----------------------------------------
>
> > From: taciturn_unquiet at hotmail.com
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: RE: [sdiy] Which programable chip?
> > Date: Wed, 15 Apr 2009 15:06:05 -0500
> >
> >> Arduino certainly looks easy to use, but it doesn't seem to have any
> >> analogue outputs. Is there anything like Arduino that also includes on
> >> board DACs (at least 12 bit)?
> >
> > That's it... there's the problem. I need 8 analog ins and 8 analog outs
> > and all the switchy bits in between.
> >
> > -Ian
> >
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