Project: A Variable Power Supply Using the LM338

Discussion in 'The Projects Forum' started by ELECTRONERD, Dec 23, 2009.

  1. ELECTRONERD

    Thread Starter Senior Member

    May 26, 2009
    1,146
    16
    Hello Everyone,

    Just recently I've designed and built my own power supply using the LM338 voltage regulator. I find it to be satisfactory; providing a adjustable voltage range from 1.2V to roughly 29.8V. The output ripple ranges from -60dB to -54dB (1mV to 2mV) when the voltage is within 1.2V to 29V. However, if I go over 29V, I receive a noisy saw-tooth wave whose peak reaches 50mV (-26dB). Clearly, the operation is best suited from 1.2V to 29V and no farther. For more information in addition to some pictures, please visit this site:

    http://electrobird.net/Analog Projects/Variable PSU.html


    I thank all of you for your contributions to my power supply, It works like a charm. I've already used it to power several other projects of mine.

    Thanks,

    Austin
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,646
    2,345
    Hello,

    The Projects Collection (as opposed to The Projects Forum) is for sharing completed projects. I've moved your post into The Projects Forum, where it will draw more responses.

    Can you post the schematic, to see where the humm is coming from at the higher voltage output.

    Good luck with your project!
     
  3. ELECTRONERD

    Thread Starter Senior Member

    May 26, 2009
    1,146
    16
    Thanks Bertus, this is the perfect place to put it!

    Austin
     
Loading...