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I have a box full of 1-6amp 12v power supply and 1 short run of 24v led strip, rated about 1.5amp draw at full blast. Can I take 2x 2A 12v supplies (ungrounded plug) to run in series to easily achieve this? Not that I can't find a small 24v source, I just want to repurpose some of the 20+ 12v wall warts I've been hoarding all this time.

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  • \$\begingroup\$ If you know enough to try it without killing yourself just try it and see what happens. It depends on details of the supply that are not available for us to inspect. \$\endgroup\$ – mkeith Apr 5 at 3:47
  • \$\begingroup\$ If possible, update your question to include a link to whatever manual or data or make and model information is available online for the power supply. \$\endgroup\$ – mkeith Apr 5 at 3:48
  • \$\begingroup\$ Disclaimer: I'm not 100% sure, but I'd be wary about connecting them even if they are ungrounded since they're still coming from the same source (AC mains presumably). I'd hold off doing anything until you get a more conclusive answer from someone. \$\endgroup\$ – JolonB Apr 5 at 5:06
  • \$\begingroup\$ Yes you can, but it comes with caveats. If you run them close to their (current) rating, one of them will have a slightly lower limit than the other. At this point, the other one will push current anyway and you are reversing voltage on the first one. Your outcome may vary from here. If you have access to two diodes, preferably Schottky, I would suggest to add one across each output before attempting to run them in series. \$\endgroup\$ – winny Apr 5 at 9:27

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