Where can I buy a 12v dc 5Amp power supply locally (in phx)

Discussion in 'General Electronics Chat' started by mackeymartin, Apr 28, 2012.

  1. mackeymartin

    Thread Starter New Member

    Dec 31, 2011
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    Anyone know where can I buy a 12v dc 5Amp power supply locally (in phx)?
     
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
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    Last edited: Apr 28, 2012
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    You can get one on ebay for about $8 including shipping.
     
  4. panic mode

    Senior Member

    Oct 10, 2011
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    you don't have any old PC collecting dust?
     
  5. mackeymartin

    Thread Starter New Member

    Dec 31, 2011
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    Yes I do have an old PC lying around.
    What are you saying? I can use the old PC power brick?
    Do I just use one of the red/which plugs that is normally used to power a dvd rom drive?
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    Is it an ATX or ATX plus 12 form factor power supply?
    http://en.wikipedia.org/wiki/ATX
    (See the pinout about 1/4 the way thru the article)

    If so, google "ATX Bench Supply" for lots of ideas on converting one of these supplies to a useful bench power supply. You will need to place a load of a couple of Amperes on the 5v supply to get a reasonably well regulated +12v out.
     
  7. takao21203

    Distinguished Member

    Apr 28, 2012
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    Actually you need a terminal like seen in the attachment.
    You need to ground the green wire for startup.

    It's possible to use only 12V, however, if you load it with some Amps (about 5 Amps), it will move towards 10 volts.

    The HF transformer indeed needs a reasonable balance (means load on 5 volts as well). Most modern ATX supplies (this one maybe 5 to 6 years old) don't need any kind of dummy load. These were needed for some older supplies (like 386, PC AT, PS/2 etc.)

    PS. if you use a terminal like in the picture, you need to tin the wire, or it will come loose very easily.
     
  8. Tobias

    Active Member

    May 19, 2008
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  9. bountyhunter

    Well-Known Member

    Sep 7, 2009
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