What is a good way to convert 110VAC to 12VDC or 24VDC

Discussion in 'General Electronics Chat' started by Sonoma_Dog, Sep 12, 2008.

  1. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
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    I wanted to use the cheapest way to get/make a converter from 110VAC to 12VDC or 24VDC.

    my current requirement is at least 2A.

    I have notice that a 2A wall wart actually cost a lot, (around 15-40 USD). does anyone know a way to make/get one for cheaper?

    Thanks in advance
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. SgtWookie

    Expert

    Jul 17, 2007
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    1,728
    If you have an old computer sitting around that has an ATX form-factor power supply in it, you can build an inexpensive bench supply out of it.

    I did that with an old 250W Compaq supply that I got for nothing, attached a plate with banana jacks, a power switch, and LEDs to show when it's powered up.

    Google "ATX bench supply" for lots of ideas.
     
  4. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
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    Sweet, I actually have had build one of those before. But what i am looking for is something smaller that I can bring around.

    Thanks for the idea tho! really appreciate it! :)
     
  5. SgtWookie

    Expert

    Jul 17, 2007
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    Well, check out Marlin P. Jones & Assoc.
    http://www.mpja.com/
    They have supplies of all kinds and all power ranges, and all price ranges.
    They even have a 12v, 2A supply for under $3.

    I don't order very frequently from them, but they always ship very quickly, and I've never been dissapointed.
     
  6. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
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    Thank you, I will look into it !
    I also have some parts need to order.

    16MHz crystal oscillator
    5 volt regulator
    IRLZ14 logical MOSFET
    and some resistor.

    do you know any website that carry a lot of different component? I don't want to buy it from different websites because of the shipping cost. I checked digikey, they dont have IRLZ14 :/
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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    Here, get an IRLZ24 instead:
    http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=IRLZ24NPBF-ND
    $1.68/each. They'll handle about twice the current as the IRLZ14 will, but that's OK.
    Why use a 2x4 when a 4x12 will work just fine? ;)

    Might want to get a few of the crystals. Try to avoid dropping them on a hard surface; they're pretty easy to break.

    As long as you're getting a 5v regulator, you might pick up a couple of LM317T's. Very versatile regulator.

    Careful with the MOSFET; they're very vulnerable to static electricity. One "zap" and they're toast.
     
  8. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
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    0
    excellent! going to order it tomorrow! Thank you!
     
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