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Dunk. The way to dispense with pwm altogether is to use a variable power supply, such as a buck convertor and monitor temperature by other means. A method of modifying ebay convertors to vary output in response to temperature would be very useful.
This is a low frequency on demand system, similar to pwm but without the constant chatter typical of mid range pwm values.
I am still playing around with the circuit and it worked on the breadboard. Time to solder it all up and see what differences are - breadboards can be unreliable - moreso with opamp circuits and may need tweaking.
Paul's input has generated a few ideas for improvement.
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