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[[File:Lowpass Filter LC.svg|thumb|right|150px|LC filter to further reduce the amount of output ripple and transients on a switching PS.]] A good clean power supply unit (PSU) is the most important part of a modular system. A proper [[Power supply (linear)|linear power supply]] and good distribution makes a big difference to the stability and sound quality of the system.<ref>[https://www.muffwiggler.com/forum/viewtopic.php?p=1470018 Best Eurorack Power Supply (PSU) for your buck?], Muff Wiggler forum, 23 Feb 2014</ref>
[[Power supply (switching)|Switch-mode power supplies]] (SMPS) are smaller, lighter, and much more efficient (give off less heat) than linear power supplies but produce
=== Safety ===
Mains voltages can kill and [[capacitor]]s in disconnected power supplies can still deliver quite a jolt. Unless you're qualified to work with mains electricity ready made external transformers are safer.
== See also ==
* [[Eurocard]]
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