Good designs of Expo Converters? Was: [sdiy] Multiplexed Expo Converter?

[cheater cheater]

Not to be picky, but are there other designs than the ASM-1 EC? I find
it's good to always compare at least 2-3 ways of doing things... and
maybe come up with something that borrows the good bits from more than
one :^)

D.

On Sat, Aug 1, 2009 at 5:56 PM, Aaron Lanterman<lanterma at ece.gatech.edu> wrote:
>
> On Aug 1, 2009, at 12:38 PM, cheater cheater wrote:
>
>> Scott,
>> thanks for your answer. I didn't know expo FM was inharmonic, I'll
>> need to check that stuff out, it sounds really neat actually -
>> inharmonicity is one thing you can use to make sounds much more
>> interesting.
>
> I've seen a detailed analysis of exponential FM somewhere, but I can't
> remember now - maybe electronotes? Wait - I think I might have seen it in a
> book Dan Snazelle showed me over coffee. Maybe it's in electronotes too. Or
> neither. Brain fuzzy.
>
> Dan, what was that book you showed me?
>
>> On another note, PM is sort of like FM but not - it's
>> very fun - check it out if you ever get a chance. Patch something
>> across an accumulator cap or something (it would be more involved than
>> that to get real Phase Modulation but might give you some form of
>> foretaste)
>
> If you're modulating a sinusoid with a sinusoid, PM and FM are sort of
> equivalent, since the integrals and differentials of sinusoids are also
> sinusoids:
>
> http://www.clavia.se/nordmodular/modularzone/FMsynthesis.html
>
>> Guys, what are some good designs of Expo Converters?
>
>
> The classic is the Electronotes/ASM-1 type; it's what I teach in my
> "Electronics for Music Synthesis" class. My lecture notes are based off of
> the description of operation on Rene Schmitz's page:
> http://www.uni-bonn.de/~uzs159. I can't recall for sure now, but I think I
> refer the students to Ian Fritz's pages if they're interested in deeper
> analysis.
>
> See Session 8: http://users.ece.gatech.edu/~lanterma/ems (and see session 7
> for a discussion of the sawtooth core, based on the discussion in "Musical
> Applications of Microprocessors."
>
> I also talk about it in my earlier version of the course,
> http://users.ece.gatech.edu/~lanterma/ems, but I'm not sure where the expo
> discussion is (probably in the Sawtooth Core or Triangle Core lecture but I
> don't remember which).
>
> - Aaron
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