[sdiy] Temperature Compensated Exponential ConverterUsing SSM2164

[David G. Dixon]

> Again the circuit I'm refering to is *not* on Roman's website.  He posted
> it to this list in 1999.  It is almost identical to Houshu's
> design.  Component values are different, that's all!

I had a closer look at Roman's circuit (thanks Ian for the schematic), and
the major difference is that he suggested a tempco voltage of 1V, which is
clearly too large for optimum tempco (0.27V suggested by Sam's simulations,
0.29V suggested by my simulations).  In fact, my simulations suggest that 1V
is a complete disaster!  Other than that, they are identical in all but
minor details, such as the choice of reference current value, which has no
effect on the tempco.

I can't wait to try it!  I foresee altering all of my VCOs (and VCFs, for
that matter) in the very near future!  This concept effectively eliminates
what is, in my view, THE biggest pain in the ass of analog synthesis.

Kudos to both Roman AND Sam!