What size fuse?

Discussion in 'The Projects Forum' started by My Tech Guy, Feb 21, 2009.

  1. My Tech Guy

    Thread Starter Member

    Feb 18, 2009
    15
    1
    We've built a small amp and a timer circuit for 12 volts and we want to add a fuse to the power line. How do we figure out what size to use? Is there a formula or a way to accurately calculate the correct size? :confused:
     
  2. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    Well first you have to know or measure the maximum current draw for you amp and timer circuits. Then you can size the fuse to be somewhat above that amount. Fuses aren't very percise in their blowing rating, they are really to protect against short circuits and major component failures.

    Lefty
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
  4. My Tech Guy

    Thread Starter Member

    Feb 18, 2009
    15
    1
    Thank you hgmjr :)
     
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