why it needs a transistor?

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Discussion in 'General Electronics Chat' started by zzz, May 25, 2005.

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  1. May 25, 2005 #1
    zzz

    Thread Starter New Member

    Dec 1, 2004
    6
    0
    I pulled apart an old dc to dc converter when i bought a new one that had more
    outputs. the old one had 12v in and 9,7,4.5, and 3 volt out. there are six resistors
    in there and one LM13---- transistor. I expected to see the resistors for the voltage decrease but i dont see why the transistor is in there. just curious.
     
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  2. May 25, 2005 #2
    mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi

    i believe that's an LM134. that is an adjustable current source and likewise a floating current source.
    :D :p
     
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