Response to Jinx, and review of some responses

[Jinx]

>But if you're interested in only the approximation provided by the other
>methods, why not just use a look-up table ?

I expect I will.  Outside the linearized range, at least.

> > "There's a third configuration, and, since it uses more parts, it follows
> > that it is a superior method [snip] So, I'm expecting the performance to
> > be the same as the other methods"
>
>Has to be one or the other !

It looks like there is no difference.  I was asking if I had missed something.

>Frankly though, a 12F675 has 10-bit ADC and would be adequate
>for a thermistor, in combination with one of the linearising methods

I think you're saying the A/D is the way to go.  I don't think my questions 
were clear.

[Harold]
[ likes lookup tables with interpolation.  Also used an A/D without a 
second thought so I take that as a vote for the A/D ]
[ he also had trouble getting parts from Maxim...how unusual ]

[Mike ... uses tables done by ADC steps for speed ]

[Bob Blick ...  keeps the PIClist tradition by suggesting an alternate 
circuit.  Harold reviews it ... "too many parts" ]

So it looks like the A/D is the way to go when you have one.  Maybe I can 
switch in other resistors to extend the range.  The application really just 
needs to know whether to switch on the fans or the heater, but reporting 
the temperature has some showoff value.

Thanks for the help.

Barry



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