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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.
=== Safety ===
Use a [https://en.wikipedia.org/wiki/Residual-current_device RCD]. 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.
== Comparison ==
{|class="wikitable"▼
▲{|class="wikitable sortable"
!Brand!!Model (& web page)!!Type<ref group="note">Trying to decide what's linear or switching, the transformers are mostly interchangeable so instead going by the type of regulators.</ref>!!Volts & max. Amps!!Transformer type!!Main components!!Distribution!!Licence!!Comments!!Further info
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|[[AI Synthesis]]||[https://aisynthesis.com/product/eurorack-power-supply/ Eurorack Power Supply]||linear|| +/-12V ||12V AC wall wart||7812, 7912||||||PCB and components kit.||[https://aisynthesis.com/diy-eurorack-power-supply-build-guide/ build guide, schematic]
|-
|[[Befaco]]||[https://web.archive.org/web/20160305071621/http://www.befaco.org/en/tienda/power-bus-diy-kit/ Power bus DIY kit]||linear|| +/-12V @ 0.7A, 5V @ 0.3A||internal switched PS +/-15V DC unit||LM317TL, LM337TL, 78M05||Regulators are on a bus with 14 headers||[https://creativecommons.org/licenses/by-sa/3.0/ CC-BY-SA]||PCB and components kit.||[https://web.archive.org/web/20160405171645/http://www.befaco.org/en/fuente-alimentacion/ schematic, assy instructions, Eagle files]
|-
|[[Clicks & Clocks]]||[http://clicksclocks.de/tag/psu PSU]||linear||+/-12V @ 1.2A||toroidal attached to PCB||LM317, LM337||Separate bus with 14 headers||With permission of Doepfer||Modelled on [[Doepfer A-100]] PSU2||[http://www2.doepfer.de/?p=2806&lang=en A-100 Technical Details]
|-
|
|-
|[[EFM Synthesizers]]||[http://www.modular.fonik.de/files/EFMforum/orgEFMfiles/3500er/3501_PSU.pdf 3501 Power Supply]||linear||+/-12V @ 1.5A||external transformer||LM317, LM337||can be adapted||||||
|Erica Synths ||[http://www.ericasynths.lv/en/shop/diy/diy-kits-1/eurorack-bipolar-12v-psu-kit/ 12V bipolar 1,5A PSU hardware kit] ||linear||+/-12V@1.5A||||||||https://www.muffwiggler.com/forum/viewtopic.php?t=125684&start=all&postdays=0&postorder=asc▼
|-
|[[Eowave]]||[http://www.eowave.com/modules/diy-kits/diy-power-supply/ DIY PSU]||switching||+12V @ 1.5V, -12V @ 0.7A,<ref>[http://www.mouser.com/ds/2/405/lm2576-405253.pdf LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator], p.20</ref> 5V @ 0.5A
||external 15V 4A DC switched brick||2xLM2576T, 7805||Separate bus with 15 headers||proprietary||PCB and components kit||[https://www.modwiggler.com/forum/viewtopic.php?t=136240&start=0 Mod Wiggler forum]
|-
▲|[[Erica Synths
|-
|[[Frequency Central]]||[http://www.frequencycentral.co.uk/?page_id=894 FC Power DIY]||linear||+/-12V @ 0.5A, 5V @ 0.1A||12V AC wall wart||7812, 7912, 78L05||1 header or solder leads to PCB||||PCB only. Inexpensive solution for small Euro system.||[https://web.archive.org/web/20160402182233/http://www.frequencycentral.co.uk/wp-content/uploads/2013/02/FC-Power-Build-Doc.pdf FC Power Build Doc]
|-
|[[Frequency Central]]||[http://www.frequencycentral.co.uk/?page_id=1766 Routemaster DIY]||linear||+/-12V @ 0.5A, 5V @ 0.1A||12V AC wall wart or 12V centre-tapped transformer||LM317, LM337, 78L05||12 Euro, MOTM, or Dotcom headers integrated on PSU PCB||||PCB only. Inexpensive solution for small Euro system.||[https://web.archive.org/web/20161215232344/http://www.frequencycentral.co.uk/wp-content/uploads/2016/08/Routemaster-Build-Document.pdf FC Routemaster Build Doc]
|-
|[[L-1]]||[http://l-1.su/Power.html 12V bipolar linear PSU+busboards]||linear||+/-12V @ 1.5A||toroidal attached to PCB||2xLD1084, 7805||Two 12 header bus PCBs with kit. +5V regulator mounted on bus off 12V rail||||Full kit for PSU + two busboards||[https://www.modwiggler.com/forum/viewtopic.php?t=128163 Mod Wiggler forum]
|-
|[[Electronic Things… And Stuff]]||[https://www.tindie.com/products/dhaillant/mini-dual-power-supply/ Mini Dual Power Supply]||linear||+/-12V @ 0.5A||12V AC wall wart||7812, 7912||Separate kits for 8 or 14 header bus||||||
|-
|[[Metatronic Mods]]||[https://web.archive.org/web/20171102184410/http://www.metatronicmods.com/store/p9/Analog_Power Analog Power]||linear||+12V @ 2.5A, -12V @ 1.5A, optional 5V @ 1.0A/0.5A||toroidal attached to PCB||MIC29300, LM2990T-12, R-78E5.0||separate||||switching regulator for +5V||
|-
|[[MFOS]]||[https://web.archive.org/web/20160115005401/http://www.musicfromouterspace.com/analogsynth_new/POWERSUPPLY2009/POWERSUPPLY2009.php Adjustable LM317/LM337 1.5A Supply]||linear||+/-12V @ 1.5A||separate transformer||LM317, LM337||||free for non-commercial use||PCB or PCB and components||
|-
|MFOS||[https://web.archive.org/web/20160409015835/http://www.musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php Wall Wart Power Supply]||linear||+12V @ 1A||external AC wall wart||LM78XX/LM79XX or LM78LXX/LM79LXX||||free for non-commercial use||PCB or PCB and components. Not Eurorack but included for completeness.||
|-
|[[ModularSynth.ru]]||[http://www.modularsynth.ru/en/diy/low_cost_psu/ Low-Cost PSU]||linear||+/-12V @ 1A, 5V @ 0.5A||AC wall wart/separate transformer||7812, 7912, 78L05||||[https://web.archive.org/web/20160412191857/http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en CC-BY-NC-SA]||||
|-
|ModularSynth.ru||[http://www.modularsynth.ru/en/2014/07/18/regulated_psu_update/ Regulated Bipolar PSU]||linear||+/-12V @ 1.5A, 5V @ 1.5A||separate transformer||2xLM317, LM337||||[https://web.archive.org/web/20160412191857/http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en CC-BY-NC-SA]||||
|-
|[[Moraydular]]||[https://github.com/vaeinoe/moraydular/tree/master/virta Virta PSU]||linear||+12V @ 1.5A, -12V @ 1A||switching wall wart||LM2991T, LM1086||12 header board with optional 7805, see [https://www.modwiggler.com/forum/viewtopic.php?t=149598&start=all&postdays=0&postorder=asc Mod Wiggler thread]||||under development||
|-
|[[stroh]]||[http://synthcube.com/cart/index.php?route=product/product&product_id=590 modular power supply]||linear||+/-12V <!--@ 1.5A -->, 5V <!--@ 1.5A -->||toroidal mounted on PCB||LM317T,LM337T,LM1086||Detachable 2"x6" 12 header board with 5x10-pin Euro, 4x16-pin Euro, 8x6-pin Dotcom/MU and 8xMOTM/Frac headers.
||||PCB only or full kit.||[https://www.modwiggler.com/forum/viewtopic.php?t=97492&start=all&postdays=0&postorder=asc Mod Wiggler forum]
|}
== Notes ==
{{reflist|group=note}}
== References ==
{{reflist}}
== External links ==<!-- in chronological order -->
* [
* [https://www.
* [https://www.
* [https://www.
* [https://www.modwiggler.com/forum/viewtopic.php?t=148733&start=all&postdays=0&postorder=asc New Doepfer Power Supply A-100PSU3], Mod Wiggler forum, Oct. 2015
* [https://docs.google.com/spreadsheets/d/17qu-PkyJnjZf9YzhNYy7X7-d-lmZqhahyUW0YM1b2N0/edit#gid=0 The big eurorack PSU list], for a wider comparison both DIY and ready made
=== Other useful power projects ===
* [https://web.archive.org/web/20160403005206/http://www.cgs.synth.net/modules/cgs73_bus.html Power Bus Board], Ken Stone's Modular Synthesizer
* [https://web.archive.org/web/20160402193654/http://www.cgs.synth.net/modules/cgs63_psd.html Power Supply Delay], Ken Stone's Modular Synthesizer
[[Category:Eurorack]]
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