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12V to 5V DC Step Down Regulator?

Discussion in 'Computers, Games, Electronics etc' started by newb, Nov 1, 2013.

  1. newb

    newb phresh VIP

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    Ok, so Im workin on a project that will have a 12V power supply. Battery sometimes, wall adapter other times. I will have multiple items drawing power at the same time. Some need 12V and some need 5V. The 5V line would be used to charge a cell phone and power a bluetooth reciever. Both require a 5V 1A feed, and I wont be able to use the wall chargers that already feed the 5V.

    Im lookin to make somethin of my own using a 7805 regulator, instead of paying double for somethin pre built, then paying that again for shipping.

    Question is, in this application, do I need to use capacitors with the 7805 chip? I know the capacitors smooth the current, but will that be a problem for me? Are either of those components sensitive to noise?

    If I need the capacitors, I might buy a regulator just to keep things looking clean. Any recomendations on one that feeds 1A? All I can find, feed 3A.
     
  2. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  3. newb

    newb phresh VIP

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    Thats one of the 3A ones I was talkin about. I need 1A. Also, is that one just a chip, or does it have capacitors in it?
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Not sure- it's a closed box. I guess I was going to do quite a bit more than just one, so I wasn't worried about quantity. You can order low quantities of 7805 chips from Digikey if you need them, or any electronics supply store...
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Oh wait, but you know that. Not sure on the capacitors- I didn't pay attention to much of my obligatory circuits class- but it probably isn't a bad idea to build a small filter circuit on the output of your 7805.
     
  6. newb

    newb phresh VIP

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    I think Ill be makin a trip to Radio Shack this week lol. Thanks
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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