Thanks for the bypassing/protection suggestions Groth. Gives me solid numbers for values. I will stick with the LM317.
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Originally Posted by Groth
Have you thought about feeding your thermistors with a larger voltage? Doesn't seem that you'll be getting the full benefit of your 12 bits/4.096 range.
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Yes I have. Two problems I see.
1. I would need a -ve supply to counterbalance the higher voltage and keep the operating level within the 0-4.096 range, if I wanted to keep the circuit as it is.
2. I'd like to keep the thermistor voltage tied to the same reference as the ADC, both the higher V+ and the V- would not be if I wanted to minimise component count.
A possible solution is this. I back track and DO use intrumentation amps.
Would this or a variation work?