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=== 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.
== Comparison ==
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|[[MFOS]]||[http://www.musicfromouterspace.com/analogsynth_new/POWERSUPPLY2009/POWERSUPPLY2009.php Adjustable LM317/LM337 1.5A Supply]||linear||+/-12V @ 1.5A||separate transformer||LM317, LM337||not specified||free for non-commercial use||PCB or PCB and components||
|-
|MFOS||[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||not specified||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||not specified||[http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en CC-BY-NC-SA]||||
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