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Ok, so here's how you solder two big pieces of copper together if you haven't got a decent gas torch.
Photo is not too good, my little Fuji is not keen on low lit close ups. But I've milled most of the 'island' off just leaving a low shoulder to butt the sensor plate against. Get onto the Wok burner and bring it up to heat then just wick the solder into the joint.
I had been intending to get subzero temps with this but reading the other thread on this subject staying above 0 in the 5-7* range is easier to manage with dew\ice issues and is still quite effective with noise reduction.. This means I can reduce my external heat sink size and weight requirements and run the TEC down in 5 volts region.
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