[sdiy] interesting expo design

[Tim Ressel]

If one were doing a combo midi2cv/vco design, this
would be a killer circuit to use. The uP could run a
multiplying DAC, which would replace the pot in the
circuit. With a 12-bit DAC, you could conceivably make
a trimless design. Very interesting...

--TR

--- Michael Ruberto <frankentron at hotmail.com> wrote:
> 
> this is interesting, check it out:
> 
>
http://www.e-insite.net/ednmag/index.asp?layout=article&articleid=CA178103&industryid=2281
> 
> the problem I see with this approach is adding in
> external CVs. I suppose it 
> could be done using a very precise VCA. the external
> CV's can be summed into 
> the VCA's CV input and the reference from IC3
> connected to IC1's + input 
> through the VCA? hmmm I imagine there would have to
> be some offset 
> correction too.
> 
> may have to experiment with this...
> 
> ~M
> 
> 
>
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