Quote:
Originally Posted by LewisM
If I plug one in direct, without heatsinks etc, I get instant cool, but then the hot overwhelms within 20 secs.
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Have you done this to all the Peltiers you are trying to use?
This may not be the cause of your problems, but powering Peltiers with no heatsinking on them is a big no-no, certainly not for 20 seconds.
Atleast, it was a big no-no when I was playing around with them a decade ago. It may not be an issue now, but I would be surprised.