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No, we did not try the DC current to TEC. That would most likely work but we would have to control the DC current from the ATMega somehow. PWM was relatively easy and required no extra parts (I had to modify the board and swap pins as our current TEC pin does not support PWM).
Another option would be to smooth the PWM-ed MOSFET output and convert it to DC. Again extra parts and extra heat losses.
You should have some rest. Again, great to hear from you!!!
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