Use a notebook ac adapter as power supply for external usb hard drive? Tags: Power Supplies Notebooks Hard Drives External USB Components Last response: April 2, 2012 10:42 PM in Components Share okppko April 2, 2012 6:16:52 PM Notebook power supply ac adapter: input: 100-240v ~ 1.4A 50/60Hz output 19V – 4.74A Can the ac adapter be build into a power supply for an 3.5” external usb hard drive? If so, can the ac adapter be used for both 3.5” and 2.5” external usb hard drives? Thanks. More about : notebook adapter power supply external usb hard drive mbarnes86 a b ) Power supply April 2, 2012 9:44:31 PM Hi If you want to destroy your Hard Drive electronics go ahead. Read voltage markings on external hard drive case or instructions. Use only correctly rated power supply 2.5" drive probably requires 5V regulated 3.5" drive probably requires 5V + 12V regulated unless hard drive case has its own built in regulator then probably 12V also get polarity wrong and burn out hard drive electronics. (if you are lucky only USB to ATA or USB to SATA electronics burnt out) regards Mike Barnes hairystuff a b ) Power supply April 2, 2012 10:42:16 PM You could use a couple of regulator IC to reduce the voltage down to the required amounts (LM2940 for 12volts) and (LM7805 for 5volts), but it would be simpler and safer to get a pre-made hard drive psu with a 4 pin molex and sata power connecter. Can't find your answer ? Ask ! Publish Related resources : Forum1TB external hard drive with no power cord required (runs on USB 2.0) ForumPossible to power a SATA drive with an AC adapter ? ForumWd 500gb external hard drive wrong power supply ForumHard drive AC adapter output voltage ForumHow to know if an external hard drive can be used on notebook Forumconnecting to external hard drive to my home network ForumExternal hard drive choice: eSATA or ( USB 3.0+EC) Forumusb powered external cd/dvd drive ForumCan you run a usb y dvd burner on a usb hub into a notebook ? ForumExternal hard drive power adapter ForumPower supply for Maxtor OneTouch Plus 4 External HDD Forum1TB external hard drive with no power supply , USb 3/seagate /western digital/,ex ForumDoes SATA external hard drive work with usb connection ForumRecovering data from broken hard drive ForumIntel Pentium E2180 help Forum[Solved] Crashed hard drive not detected Forum[Solved] More power? and how to tell? Forum[Solved] Power Supply enough for SLI? ForumUse 3.0 hard drive to esata ForumPOWER SUPPLY CABLES CAUSE AN INCREASE IN TEMP? More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !