I have a project which requires a high current output (potentially 60A). Rather than get a lab bench supply, I got hold of a Corsair ATX AX1200i that can supply a max of 100.4A on the 12V wire.

I've followed an instructables guide on getting an ATX to run without being attached to a motherboard (soldered the green wire to a ground) and got a 12V wire from the 24 pin connector, as well as a ground wire.

However, when I connect the supply to my circuit (mainly a Peltier configuration), the peltiers barely cool. What's more is that the current seems to be throttling to 0.1A.

What am I doing wrong/ am I using the wrong connector (+12V wire on the 24pin connector as opposed to any others).

  • \$\begingroup\$ It looks you modified the power supply, and did something wrong during that modification. Let me get some necessary tools (I have no idea where I put them) and I will tell you exactly what you did wrong \$\endgroup\$ – PlasmaHH Jul 20 '15 at 12:56
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    \$\begingroup\$ You may find that you'll need to load all the rails in order to keep any of them in regulation. \$\endgroup\$ – Ignacio Vazquez-Abrams Jul 20 '15 at 12:59
  • \$\begingroup\$ To add to Ignacio's comment - that means all of the different output voltages, not just all of the +12V wires. (and for 60A your should be using more than a single +12V wire already) \$\endgroup\$ – brhans Jul 20 '15 at 13:02
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    \$\begingroup\$ A schematic would certainly help here... \$\endgroup\$ – Nick Johnson Jul 20 '15 at 13:05
  • \$\begingroup\$ +12V wires are typically yellow and the ground wires are black. parallel all the black and yellow wires and connect them to your load. (or at-least use as many blacks to the ground input as yellows to the other input and use all the yellows. \$\endgroup\$ – Jasen Jul 20 '15 at 13:07

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