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Discussion in 'Electronic Basics' started by Dave, Jun 10, 2005.

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  1. Dave

    Dave Guest

    I would like to build a portable battery power supply for my portable
    USB hard drive/CD/DVD enclosures.

    Based on the cover of the normal power supply, it delivers: +5V/1.5A
    and +12V/1.5A to the enclosure.

    For size and performance, it was suggested I start with two 9.6V
    1800mAh R/C type batteries.

    I was told I should avoid the cheap, inefficient Radioshack type
    voltage regulators as a good portion of energy is wasted as heat.
    I was told I need the efficient stepping kind which start with a part #
    of LN or LNB - if someone could provide those two part #'s that'd be

    I understand I need two of those regulators, to step up to +12V 1.5A
    and of course one to step down to +5V 1.5A. Who knows if up to 1.5A is
    actually drawn, but I want to have that capability. A 56X CD burner
    doesn't burn out the plug-in supply.

    Now I know I need some caps, resistors & other components, but my
    knowledge is rudimentary so I have NO IDEA what I need, sorry...this is
    a .basics posting.

    With the help of a book, I could read a diagram and have the tools and
    aptitude to build this thing, just coming up short on the components

    Yes I know this is a simple project to some, but help greatly

    Yes this was posted with Google, ports not open at work for newsreader.

    Yes, you can save the flamemail about etiquette or knowledge, etc,
    other comments for another day.

    Thanks in advance,
  2. Dave

    Dave Guest

    OH, I would also like to have an undervolt lockout capability as I'm
    sure a harddrive would not respond well.
  3. John Bokma

    John Bokma Guest

    Now that would have been something to put in your subject, don't you think?
  4. John Larkin

    John Larkin Guest

    Connect the batteries in series for about 18 volts. Then buy two
    packaged 3-terminal buck switching regulator boards from Mouser or
    Digikey, one for +5 and one for +12, about $15 each. You can't make it
    out of parts for much less, and the Mouser things will work right out
    the box.

    Or sign up for engineering school.

  5. Dave

    Dave Guest

    no. That line would have been time better spent elsewhere.
  6. John Bokma

    John Bokma Guest

    Sure, and you just keep wondering why people ploink / ignore you.
  7. Rich Grise

    Rich Grise Guest

    My primary complaint about googlegroupies is that they forget to include
    any context when they reply (or followup). googlegroups by default
    doesn't include any context, so you'll need to copy/paste the context
    that you're replying to.

    Good Luck!
  8. Dave

    Dave Guest

    Well, an answer already came... My subjects work everytime.
  9. John Bokma

    John Bokma Guest

    Yeah, you are such a smart guy.
  10. Dave

    Dave Guest

    I know, and you're the way too smart, arrogant, nerd newsgroup police
    who can't refuse the comment? Need a girlfriend? Not spending enough
    time with the current one?
  11. Dave

    Dave Guest

    Ah, Perl programmer, explains it all.
  12. John Bokma

    John Bokma Guest

    No, you got your feelings messing up your brain cells (all 4 of them)
  13. Dave

    Dave Guest

    Heh. Real bright.
  14. John Bokma

    John Bokma Guest

    I am sure you will be able to get there if you stop trying so hard.
  15. Dave

    Dave Guest

    Having trouble letting go of trying to so how sarcastic and what a
    smart technical monkey you are? I come here when I need something,
    seems you post just to post; be it to comment on "newsgroup etiquette"
    or subject lines...or whatever your narrow point of view leads you to

    I'll let you have the last word, I know you can't resist showing off
    your witty response - ego I suppose. Have at it son. I'll be back the
    next time I need something.
  16. John Bokma

    John Bokma Guest

    Sure, and you probably are going to do that the "smart" way again. Look at
    how other people compose their subjects. Who is the person with an ego
    problem? Yup, *you*.

    A subject is a subject, not a place to put an off topic "funny" sentence.
    Try to give a short and exact description of your problem. More people who
    can help you will read it.

    You get help here for free. You are wasting the time of people who decide
    to read your post, but can't help you. You mislead people.

    So who is the person thinking he's a smartass? Yup, *you*.

    Have you learned anything from this? I am sure no. Because of your
    "little" ego problem.
  17. Dave

    Dave Guest

    Right, ego is a long winded response, or a lesson... You're trying so
    hard to be right, and you have all the evidence in the world to be
    right, that's ego.
  18. Dave

    Dave Guest

    I got what I wanted, my goal was fullfilled - I ALWAYS get help here
    and will continue to do it my way, because it works me. YOu do what
    works for you.

    Talk about ego, you want me to do what works for YOU, why whould I?
    There's no lesson from you, why would I take one from you? What have
    you done that would enroll me to see your way except be sarcastic?

    That's not enrolling... What's in it for me? Presented another way, I
    might have considered. Is that you Andrew? Being a jerk is cracking
    me up...

    So, we can continue to slap cocks together, be right. That's fine.

    "You get help here for free. You are wasting the time of people who
    to read your post, but can't help you. You mislead people."

    Key word is "decide." Choice, you know what that means, right? You
    did it, you should know, you chose to read it.

    Does it irk you that I got a response right away? An actual
    resolution? I bet it does.

    *Your* words imply you covet this forum, and insist on compliance, yet
    does continuing to slap cocks with me in this sci.electronics.basics
    venue really in the spirit of this group? The hypocrisy.

    It could be your trying to be right about it, because you're the monkey
    that "decided" to read it. You didn't have to, but you did, you
    decided. You had a choice, there's freedom in that don't you think?
    You really didn't have to, but you did. So, you can be a baby about
    your choice, or you can let it go. I doubt you can however, too much
  19. John Bokma

    John Bokma Guest

    No, that's being right. Trying to say that *you* did nothing wrong is just
    being plain stupid.
  20. John Bokma

    John Bokma Guest

    and time of some people wasted. Did you pay them for your time?

    If you had picked a good subject people could have read more selective.

    Imagine that everybody here posts "Oh boy, Me needs help" etc subjects.
    But wait, you are to stupid to understand my point, even after several

    Maybe instead of being a keyboard cowboy, and a Usenet hero you should
    read this article and maybe, maybe you are able to learn... a lot...

    - I ALWAYS get help here
    but it wastes time of other people. Do you pay them? No. Again, imagine
    all people here posting stupid subjects and being a smart ass like you.

    How readable does this group become then? Use your brain for a little
    Because you need help smart pants.
    The problem resides between the chair and the keyboard or in short:
    Well, take it from this guy then:

    Or just look at the subjects in this group. How many are written by the
    dumbest member of the Homer Simpson fanclub? Yup, one. It's yours.

    [ idiot's rambling snipped for brevity ]
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