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Hi Jo.
It will be less of a headache to use a linear supply and map temperature differentials against voltage. That way you can make adjustments through the imaging session to account for night time temperature reduction.
Have you checked your soldering. Is there a chance you have damaged the speed control pot.
I am still working on refining the design specifically for DSLR TEC temperature control. I have followed all the advice given me along with lots of reading about soft and delayed switching. All helpful, except that DSLRs are very sensitive to any switching in the mosfet.
The circuit posted earlier is very quiet, but still needs improvement.
Short of strapping a 10 - 22uf capacitor across the pins to absorb the switching spikes I have not yet found a quiet low energy loss solution.
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