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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]] are smaller, lighter, and much more efficient than linear power supplies but produce more noise on their output.<ref>[http://cp.literature.agilent.com/litweb/pdf/5990-3242EN.pdf Understanding the Importance of Low-Noise Linear Power Supplies]</ref>
=== Safety ===
For safety ready made PSUs are included in this comparison of available PSUs.
Unless you're qualified to work with mains electricity ready made external transformers are safer. Also charged [[capacitor]]s can deliver quite a jolt.
{|class="wikitable"
!rowspan="2"|Brand!!rowspan="2"|Model (& web page)!!colspan="3"|Current rating (A)!!rowspan="2"|DIY/Ready built!!rowspan="2"|Transformer!!rowspan="2"|Bus!!rowspan="2"|Schematics!!rowspan="2"|Comments!!rowspan="2"|See also
See [[Comparison of Eurorack PSUs]]
|-
!+12V!!-12V!!+5V
|-
| [[4MS]]||||||||||Ready made||Switching||||||||
|-
| [[Befaco]]||||||||||||||||||||
|-
| [[Doepfer]]||[http://www.doepfer.de/a100z_e.htm A-100PSU3]||2||1.2||4||Ready made||Switching, mounted on PCB||Separate A-100 bus||none||Supersedes previous models since 2016||[http://clicksclocks.de/tag/psu Clicks & Clocks]
|-
| [[MFOS]]||[http://www.musicfromouterspace.com/analogsynth_new/POWERSUPPLY2009/POWERSUPPLY2009.php Adjustable LM317/LM337 1.5A Supply]||||||||||||||||||
|-
| [[MFOS]]||[http://www.musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php Wall Wart Power Supply]||||||||||||||||||
|-
| [[Synthrotek]]||[http://www.synthrotek.com/products/modular-circuits/deluxe-power/ Deluxe Power Module]||||||||||||||||||
|-
| Synthrotek||[http://www.synthrotek.com/products/modular-circuits/eurorack-power-distribution-boards/ Eurorack 5A Power Supply]||2.2||1.3||1.5||||||||||||
|-
| [[Tiptop Audio]]||[http://www.tiptopaudio.com/zeuspwr.php Zeus]||||||||||External switching brick 15V DC, 4.6A, 2.5mm [[DC jack]]||||||||
|-
| Tiptop Audio||[http://www.tiptopaudio.com/zeusmicro.php μZeus]||||||||||||||||||
|-
|}
== See also ==
|