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How to Modify Server Power Supplies as cheap powerful PSUs
The Ultimate Server PSU Thread - cheap and great PSUs successfully tested by members of xsimulator.net http://www.xsimulator.net/community/threads/the-ultimate-power-supply-thread-for-sim-builders.6793/
This original tutorial by @Slider on modifying HP Server PSUs also contains subsequent posts by @RacingMat and @Nick Moxley on how to modify Dell 2950 PSUs: http://www.xsimulator.net/community/threads/how-to-modify-a-server-power-supply-for-12v.5774/
Even more powerful 2000 watt server PSUs can be modified, as outlined by @Pit, just be aware there are cooling and house wiring safety matters to consider: http://www.xsimulator.net/community/threads/2000-watts-server-supply-dps-2000bb-a.6709/
Some people use 24V DC motors for their motion simulators. Server PSUs can be wired in parallel as outlined here by @benj, but do not ignore the safety warning by @kirk on the same thread regarding not removing A/C ground: http://www.xsimulator.net/community/threads/wiring-server-psus-in-parallel.6251/