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Stable Voltage Supply

Discussion in 'Electronic Basics' started by Randy, Mar 8, 2007.

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  1. Randy

    Randy Guest

    I need a stable and precise Voltage source to supply a Data
    Acquisition system.
    I need 5V DC. What are my options for an inexpensive unit?

    I have some surplus supplies to include four 12V DC Supplies from a
    rack mounted system that should provide a good signal. How can I get a
    5V output?
  2. Dotinho

    Dotinho Guest

    Randy escreveu:

    you just usa a power regulator like 7805, search in google for
    datasheet 7805, you will see that is very simple...
  3. Noway2

    Noway2 Guest

    Getting a 5V regulator is just the tip of the iceberg.

    You need to consider what it is that the power supply is doing for you:
    providing a stable supply (and reference, ie ground) over varying
    conditions of load, transients, frequencies, etc. A solid power supply
    (and return) for a digital system, such as your data acquisitions
    system, must be properly designed. This takes a lot of effort. One for
    a mixed signal system, including digital and analog is even more complex.

    I would recommend that you do a fair amount of research and learning
    before you even attempt to implement the power supply. Not
    understanding what it is that you need to accomplish will only lead to
    confusion, frustration, and failure.

    I personally, found Dr. Howard Johnson's books (and website to be very informative in this regard, though there are
    other resources available. As far as a place to start, try searching
    for the concept of 'decoupling or bypass capacitors'.
  4. ehsjr

    ehsjr Guest

    You need to: 1) specify what "stable" and "precise"
    mean; 2) build a supply that meets those specs, and
    3) make the voltage *at the acquisition board* "stable"
    and precise. The best supply in the world won't help
    if the supply is "corrupted" at the board and at
    the individual chips. (That's what happens.) My guess
    is that you won't have a problem using a simple supply
    at the supply end of things, but you'll need to pay a
    lot of attention at the board.

  5. Rich Grise

    Rich Grise Guest

    The simplest, and probably cheapest when the smoke clears, is
    a 5V wall wart, rated at the current you need, or more.

    Good Luck!
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