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Electronics Small Homemade PSU ?

Discussion in 'Modding' started by emj1s, 4 Nov 2004.

  1. emj1s

    emj1s What's a Dremel?

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    How can i take 120v AC and turn it into 5v DC. I have the transformer, part # 273-1385-radioshack) and i need to know what else to get and how to assemble it without killing myself. :worried:

    Any help is appreciated. emj1s
     
  2. cpemma

    cpemma Ecky thump

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    You'll need a bridge rectifier, 1A 50V will do, say Catalog #: 276-1173, a smoothing capacitor around 1000uF 35V or more, say Catalog #: 272-1032 and a 7805 voltage regulator with an output capacitor such as the 10uF tantalum Catalog #: 272-1436, or a couple of cheap ceramic 100n-220n would do, one either side of the regulator.

    At maximum load the regulator will be losing over 3W so it will need a heatsink like Catalog #: 276-1368 if you're going over 100mA.
     
  3. emj1s

    emj1s What's a Dremel?

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    are those radioshack #'s and how do i assemble it, i have no idea at all, except i want to plug it into a wall and have 5v coming out.
     
  4. sinizterguy

    sinizterguy Dark & Sinizter

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    If you are asking how to assemble it, you might be better off buying a ready-made adapter IMO. Not meant as an insult, but no one here would want you to electrocute yourself.
     
  5. cpemma

    cpemma Ecky thump

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    Looking at those RS prices it will probably work out a lot cheaper too. Look for a regulated adaptor, or just build the 5V regulator side (2 small capacitors and a 7805) and use a basic 9-12V wallwart, you must have a few old ones round the house.

    Whole thing looks a bit like this:

    [​IMG]
     
  6. emj1s

    emj1s What's a Dremel?

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    ok, um, lol, siniz your probly right this time round. can anyone point to a kit or asembled psu that plugs into the wall, about 120v, and pulls down to 5 to 12v out.
     
  7. emj1s

    emj1s What's a Dremel?

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    Whats a wallwart
     
  8. Herbicide

    Herbicide Lurktacular

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    This is a wallwart...

    [​IMG]

    It's basically an adapter either built into, or in line with a plug.

    - H.
     
  9. theshadow27

    theshadow27 What's a Dremel?

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    just go to radioshack and ask for a 6volt power adapter, they will hand you one that can source about an amp and costs about 10$ american. thats all you need to do


    http://www.radioshack.com/product.a...name=CTLG_009_001_001_001&product_id=273-1761

    (Catalog #: 273-1761) for example

    then get a diode and put it inline with the circut, it will drop it down to 5.4v

    or you can buy a 4.5 v adapter... it all depends on what your doing
     
  10. zz300

    zz300 What's a Dremel?

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    I f you're not too concerned with looks (or are going to hack it up anyway): these guys have some good deals.
     
  11. emj1s

    emj1s What's a Dremel?

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    thanks for all of yalls help. im just gonna chop a walwart up and mod to my needs, thanks.
     

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