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Originally Posted by Incoherent
How are you wiring the pot? This might be stupidly obvious but, One end should be at +5V, the other at ground (0V) and you should monitor the voltage at the wiper.
The 100k bead thermistors should be fine.
Put them each in series with 40k resistor a between the +5v and 0v with the thermistor closest to the +5v and monitor the voltage at the connection. The curve will look something like the attachment. To reduce the linear temperature range increase the resistor value.
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The 100k Pot works perfect thanks
I dont have any 40k resistors how would i use the pot ?
at the moment i put the 100k thermistor on the center of the pot and then to the 3118. all i get is a wave and the amplitude increases when i touch the thermistor.
I am going to look though this thread again i am sure i saw something like this in there.
(edit) i put the thermistor across the pot 5v and the output and it works ok.
I tried running the power of the pc psu and a switch mode psu but they are both the same.