[sdiy] Temperature Compensated Exponential ConverterUsing SSM2164

[Magnus Danielson]

David G. Dixon wrote:
>> 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!

If you read Roman's email, you will see we need to blame Paul Maddox as 
well, even if only inspirational. :)

I need to try it.

Cheers,
Magnus