Power supplies and Amperage!!

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

  1. electronewb

    Thread Starter Member

    Apr 24, 2012
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    Let's say an electronic device is rated for a power supply at 12VDC @ 1A Would it be OK to use a power supply if the voltage is the same in that case 12VDC but at higher amperage?
     
  2. #12

    Expert

    Nov 30, 2010
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  3. electronewb

    Thread Starter Member

    Apr 24, 2012
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    Thanks!! That's a good read!
     
  4. #12

    Expert

    Nov 30, 2010
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    There is a certain level of n00bie that it fits just right, and you asked just the right question to be a likely fit.

    Glad I could point ya' to it.
     
  5. electronewb

    Thread Starter Member

    Apr 24, 2012
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    The comments aren't too flattering to the writer of that paper!!!
     
  6. electronewb

    Thread Starter Member

    Apr 24, 2012
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    So basically the voltage has to be the same but the amperage will work as long as it's equals or above the device rating So in that case a 12VDC 100Amp supply would work?
     
  7. P-MONKE

    Member

    Mar 14, 2012
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    Yep.

    But it would cost rather more than the supply you would actually need. :D
     
  8. mozikluv

    AAC Fanatic!

    Jan 22, 2004
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    hi,

    were's the logic of using a 100A PSU? of course it will work because the current that will be drawn will only be what the device requires.

    mozikluv
     
  9. P-MONKE

    Member

    Mar 14, 2012
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    I think the poster was being hypothetical.
     
  10. MrChips

    Moderator

    Oct 2, 2009
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    Not quite. A 12VDC 100A supply is a car battery.
    When you are prototyping and experimenting you do make mistakes sometimes.
    Have you ever shorted out a car battery? The results are spectacular.
    You need a power supply that has short circuit protection.

    For simple electronics experimentation, a simple 9VDC @500mA adapter into a LM7805 voltage regulator is a better choice.
     
  11. #12

    Expert

    Nov 30, 2010
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    and yet, there is a certain audience that it is perfect for...like you.

    The result? I don't send "hopelesly pedantic" people to read it (as one of the criticizers signed himself).
     
  12. electronewb

    Thread Starter Member

    Apr 24, 2012
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    My question was hyper hypothetical Just making sure that the theory is right!!!
     
  13. #12

    Expert

    Nov 30, 2010
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    Yep. "Enough" is all you need. The excess won't be used.
     
  14. MBVet05

    New Member

    Jul 21, 2011
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    You should always use a power supply rated at or just above what is needed. If you need a 12v dc at 1A then a power supply rated at 1-30vdc at 3a is suffiecent.
     
  15. Audioguru

    New Member

    Dec 20, 2007
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    My car battery can supply 800A when cold to a cold starter motor.
    But the clock in my car draws only 0.01A or less, not 800A.
     
    PackratKing likes this.
  16. Lundwall_Paul

    Member

    Oct 18, 2011
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    You could use a 60 Amp car battery if you wanted.
     
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