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Thanks Paul. PID is an ideal alternative and warrants more investigation. Thanks for the explanation. I guess the opamp thing is intended to be a very cheap and easy 4 channel controller, as well as a bit of an electronics self-tutorial.
I have made a few changes to the Vcc section to accept 3 - 15v DC, without too much change in the reference voltage, reducing the number of potentiometers to 1, while keeping the supply voltage for the opamp and temp sensor in limits. 12v is probably the maximum anyone would want to use.
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