[sdiy] Temperature Compensated Exponential Converter Using SSM2164

[cheater cheater]

If all voltage references are made ideal using voltage reference
components, then what are we left with that's using the voltage rails?
I'm not really clear on that - would someone like to comment?

But I do think that the whole thing with voltage references is useful,
in that - hey - we're using a voltage reference (a voltage rail)
anyways. So we might as well get it right. Otherwise we'll just end up
with more stuff to fix in later designs.
One might argue that it'll give us 'digital correctness' that is 'too
good' but there's nothing wrong with that. It's a completely different
discussion altogether, but in my opinion digital doesn't sound bad to
people because it's *correct*.

On the other hand, it's interesting to think about how the things in
our synths interact through the voltage rails. For example, the
'crappiness' of the Model D's power supply and such. Maybe we need to
approach the problem from the other end: instead of thinking about
whether a specific 'interaction' through the voltage rails is
necessary to keep a design's 'sound' intact, remove all of them, and
introduce them in subsequent designs..

D.

On Tue, Sep 8, 2009 at 5:30 PM, Ian Fritz<ijfritz at comcast.net> wrote:
> At 10:06 AM 9/8/2009, David G. Dixon wrote:
>>
>> Let's face it: unless you're some kind of 'accuracy fetishist', the
>> references are only really necessary at critical points, such as the
>> tempco
>> voltage for the expo we've been discussing, and perhaps for certain
>> operations like precision wave shaping, where it might ease or eliminate a
>> trim.
>
> I always use subregulation for freq controls and for reset trip points in
> VCO cores (as examples). Maybe it is a fettish, but to me it doesn't make
> sense to only fix some sources of error and drift.
>
> Ian
>
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