dc42:
spandit:
I hope you are right (and that my simplified circuit is a sufficient analog of the real intended circuit!You haven't said what your real intended circuit is, so we don't know whether that is true or not.
Fair point! The node (where we're measuring Vo) is the input to a Megasquirt EFI controller which normally measures the voltage across a potential divider (between the 2490Ohm resistor and a thermistor). I'm giving it a voltage feed from an Arduino instead (the software is taking the average of 4 thermistors and combining them into 1 output whilst also displaying all 4 on an LCD bargraph). It's more or less finished but probably needs a few tweaks