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HOW TO CHANGES VOLTAGE

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Discussion in 'Electronics Homework Help' started by iamasd, Nov 1, 2012.

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  1. Nov 1, 2012 #1
    iamasd

    iamasd

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    Nov 1, 2012
    im doing a school assigment currently i need to changes the voltage from 3.3V to 1.2V W/O using a voltage regulater. PLEASE HELP IF YOU KNOW!!
     
  2. Nov 1, 2012 #2
    Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Use a resistive voltage divider.

    Note: If you add a load to the output of a resistive divider, the voltage will drop below the calculated value. If you need a stable output voltage with load current, you need a voltage regulator.
     
  3. Nov 1, 2012 #3
    CocaCola

    CocaCola

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    Apr 7, 2012
    Alternately for a quick and dirty you can use a few diodes (or a single diode) in series that add up to the proper voltage drop you need at the current you will be pulling...
     
  4. Nov 1, 2012 #4
    iamasd

    iamasd

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    Nov 1, 2012
    it works thanks alot. so this only will work if my input is constant?
     
  5. Nov 1, 2012 #5
    Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Without regulator: If the input changes, the output hanges, too.
     
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