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Heat sink is an aluminium one bought at Jaycar - finned like a computer one. Heat side has a PC heat sink and fan- I reversed the fan to extract instead of blowing.
If I plug one in direct, without heatsinks etc, I get instant cool, but then the hot overwhelms within 20 secs. I am using 12V DC, at about 3 amps I guess (too much probably). If I use the 1 amp transformer, I get the same. If I drop it to .5 amps, I get nothing
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