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Discussion in 'General Electronics Discussion' started by ferulebezel, Jan 10, 2013.

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  1. ferulebezel


    Dec 11, 2012
    I built a nifty little circuit that is running on the edge of the current capacity of 3 aaa batteries. It works intermittently when I jiggle the batteries in the holder, but runs fine off a power supply.

    Anyway could I slap a 4.5 or 5 volt regulator on top of a 9 volt battery and get my 4.5 volts with more than enough current available? The load varies like crazy.

    I'm also concerned about waste and head dissipation.
  2. davenn

    davenn Moderator

    Sep 5, 2009
    hi there

    find a more reliable battery holder ... looks like you have a faulty one...

    those small rectangular 9V batteries have very low current capability
    only a few 100 mA ( ~ 340mA) its not gonna last long specially when 1/2 the power is being lost in regulation

    Last edited: Jan 11, 2013
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