Power supply price

Discussion in 'General Electronics Chat' started by achie14, Aug 28, 2014.

  1. achie14

    Thread Starter New Member

    Aug 28, 2014
    how much is the estimated amount when making 1.25V - 37V 1.5A Variable / Adjustable Power Supply
    Using LM317 ??
    Last edited by a moderator: Aug 28, 2014
  2. crutschow


    Mar 14, 2008
    Depends upon where you are and how elaborate you want for the case and meters. The electronics are cheap. It's the transformer, case, meters, heatsink, and other hardware that are the main cost.

    Note that you can't go up to 37V @ 1.5A with an LM317. Look at the data sheet of output current versus voltage across it. Also its power dissipation will get very high at a low voltage output with 1.5A, requiring a very large heatsink.
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    1. Write down a list of every component (electrical or mechanical) you intend to use. This is traditionally called the “Bill of Materials” or simply the BOM.

    2. Find a source for each and every part.

    3. Copy down the prices from #2 into #1

    4. Sum all the prices in #1. Don’t forget to account for multiple parts when and where used.

    That’s it. No magic to it, just some dog work.
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Expensive bits (in order of decreasing price): Transformer, filter capacitor, heatsink, box to put it in, rectifier, pot...

    By the time you get to the chip, it is almost free by comparison.

    You might get something out of this thread....