Another powersupply

Discussion in 'General Electronics Chat' started by nerdegutta, Nov 4, 2014.

  1. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,514
    784
    Hi,

    with reference to this thread:

    Powersupply for Raspberry Pi

    That powersupply work with the RPi, but now I want to make a better one. Meaning there is nbo rushm and I have better time.

    I got a few LM338, and reading the datasheet, I got this schematic:

    Rpi_sch_v1.png

    Would this work?
     
  2. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    If I read the formula right, a 470 ohm pot would be much better, that should give adjustment up to over 6V, make sure you have enough heatsinking to dissipate 7W for the model B pi, or 14W for the B+.
    Maybe better still is to use a 330 ohm fixed resistor and a 100 ohm pot in series, better adjustment and probably more stable.
     
  3. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,514
    784
    Thanks for the reply.

    I got those parts.
     
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