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have any ideas on the power supply situation?
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In general, it's better to run a TEC off a dedicated supply. But if you have your beefy 550 watt ATX supply supply it may work. Measure the current usage of your TEC with a multimeter. To do this, strip or somehow expose 2 points on the
same wire, ie on only the black or only the red lead to the TEC, place the multimeter leads on the wire one after the other, not sure which goes first, probably the black multimeter lead, set the mode to dc amperage with a range of at least 20 amps.
If it's a small enough draw, you'd be all right running it off your ATX supply. Otherwise you can build or buy (I recomend build) a dedicated 12v supply. I believe Honeywell makes such supplies, but I'm not sure.