[sdiy] Temperature Compensated Exponential ConverterUsingSSM2164

[Magnus Danielson]

cheater cheater wrote:
>> I think we need to have some heater/tempsensor hooked to it only for the
>> purpose of trimming.
> 
> How will you know your temp sensor isn't lying?

Oh, I know it will, so I don't worry to much about it lying to me, as it 
will always do that, just as with any other measurement.

What I do care about is that when doing such trimmings I want to stay at 
some different set of temperatures with some fair stability. I don't 
really care about hitting say 25,000000 C, 35,000000 C and 45,000000 C.

So what temperatures I hit isn't very important, but ability to maintain 
them and return to them during that trimming-session is what is important.

But ovenizing just about anything is difficult. Just showing a heater 
and some heat sensor does not necesserilly make a good ovenizer. But 
maybe I am just making things more complex than they need to be?
Anyway, tempco-trimming does hurt in a different scale than traditional 
trimming. But if you want to play that game, well...

Trimming a system like Osamu-san proposes, requires (to the best of my 
abilities) the need to check that the influence of the trimming makes 
the temperature dependence to go down (which is point of the trimming) 
so beyond checking the CV scaling regularly also the temperature 
sensitivity needs to be checked. I assume that a few runs of scaling 
test is run at each temperature, then heating up or cooling down to the 
next temperature. Wait until it stabilize, run again.... booring stuff.
I am very tempted to toss a CPU at it, but where is the fun in that? :)

Need to study the actual formulas to figure out a good algorithm. If 
somebody beats me to it, fine. Just shows how much thinking I don't do.

Cheers,
Magnus