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Zener Diode

Discussion in 'General Electronics Chat' started by GatorGnet, Feb 25, 2010.

  1. GatorGnet

    GatorGnet New Member

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    In this programmer schematic, it uses a zener diode to drop the voltage down from 12v to 5. In an effort to better understand how things work I have to ask how this works. Pin 14 is supplied the 12v directly after a 220 resistor but a 5.1 zener is connected as well then to ground. How does this drop down the 12 volts?


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    Last edited: Feb 25, 2010
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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  3. GatorGnet

    GatorGnet New Member

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    Thank you Eric, that makes more sense. I trust the schematic but I don't want to fry parts. And of course better understand why things work.
     

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