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Benchtop Power supply Vs. Modified Computer PSU power supply

Discussion in 'Electronic Basics' started by none none, Feb 18, 2007.

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  1. none none

    none none Guest

    What would be the advantages of having a benchtop power supply that was
    designed and sold for the purpose of powering breadboard projects over
    taking a computer PSU and modifying it so you can tap the 12V and 5V lines
    to create a benchtop power supply?
     
  2. The switchmode pc supplies work ok if you don't require it to supply high
    current pulses. ( as in if you try to power a headlamp or even sometimes a
    turn signal lamp, will cause it to shutdown. )
    The 5 volt line is not so bad for shutdown's and can handle more brunt
    power.
     
    Rich_Markley and Engineer_Paul like this.
  3. You usually need a minimum load on the computer PSU. You may find you have
    more noise also.


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  4. Phil Allison

    Phil Allison Guest

    "none none"

    ** Same advantages as using a small spade in the garden instead of a
    bulldozer.




    ........ Phil
     
  5. One less piece of equipment to suspect when things don't behave.
    On bench worth its weight in diamonds.

    HTH

    Stanislaw.
     
    Rich_Markley likes this.
  6. jasen

    jasen Guest

    their behavior when short cuitcuited.

    a 20A short sircuit will burn the tracks of veroboard, and ruin a solderless
    breadboard.

    the lab supply probably has better no-load regulation too.

    if you can't afford a lab supply use a 300ma, regulated wall-wart (or other
    apropriate size).


    Bye.
    Jasen
     
    Rich_Markley likes this.
  7. Ban

    Ban Guest

    A useful Benchtop PS has adjustable voltages(course/fine) and adjustable
    current limiters. It usually also has a display for V and I of each output,
    which are ground independent. There is no fan noise and regulation is mostly
    linear with very little noise and ripple.
    None of these features can be achieved with a ATX supply.
     
    Rich_Markley likes this.
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