Couldn't a TEC controller just be made with a t-balancer driving a relay or a power resistor?
Or just a simple curcuit with a thermistor and a variable resistor switching the TEC on above a certain temp.
Ofcourse precision might be a bit off, a digital thermometer and a PIC controller could make it much more accurate (as accurate as the digital thermometer) and easier to vary between different temperatures. No complex circuit would be needed for that, just a bit of knowledge with programming PICs. Add a 16x1 lcd display and there might just be a small market.
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