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7805.. hot. Suggestions?

Discussion in 'General Electronics Discussion' started by jgauthier, Mar 22, 2013.

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  1. jgauthier

    jgauthier

    31
    1
    Mar 22, 2013
    Hey everyone,

    I'm pretty new to electronics. so, be easy. I've taken most fundamentals course and have a good understanding, but I'm very limited on practice and experience. I learn best by experience, so I am doing things and trying to apply them to my book learning.

    So, I am working on a project that requires 5 volts, at about 1-1.2A. My source is coming in as 12V. This is a hard requirement. On my breadboard, I am using a standard 7805. After my load is 100-150mA (sustained) my 7085 gets VERY hot. I understand why this is, but in the end my load is going to potentiall be 1.2A. the 7805 is rated for this but the package size I am intending cannot possibly handle the 10lb heat sink I would need on this :)

    Anyway, I am looking for advice.. there has to be a better way. I want to take 12V to 5V, at 1.2A without creating a fireball. Any other suggestions?

    Thanks so much!
     
  2. GonzoEngineer

    GonzoEngineer

    321
    0
    Dec 2, 2011
    Last edited: Mar 22, 2013
  3. jgauthier

    jgauthier

    31
    1
    Mar 22, 2013
    That's great. Thank you. $15 is a little pricy, but I bet that's common feedback!
     
  4. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Where did you get $15? The part linked in that post is $4.30.

    Bob
     
  5. GonzoEngineer

    GonzoEngineer

    321
    0
    Dec 2, 2011
    The $15 part is from some assholes that take the $4.30 part from Digikey and put
    a cute little label on it and resell it.

    Read post #18 for the Digikey part number.

    (Sorry, BobK, I didn't see your post above this.)
     
  6. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    To be fair I believe the $15 are custom PC boards under the wrapper, they will do a run in any voltage if you buy in bulk suggesting a custom design...

    But, yes if you need a fixed common voltage just get the ones from Digikey, I only linked to the other company because I had a bookmarked it several years ago and had it handy...
     
  7. jgauthier

    jgauthier

    31
    1
    Mar 22, 2013
    Thanks! I don't know how I missed the $4.30 part.
     
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