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12V battery to be dropped down to 6.5v

Discussion in 'Power Electronics' started by BATEMAN, Nov 29, 2010.

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  1. BATEMAN

    BATEMAN

    3
    0
    Nov 29, 2010
    Hiya, i have bought a 12v power pack with charger so i can power a night vision periscope,
    the image intensifier inside the periscope is rated (min - 6.5v) (max - 6.75V) and so the question is: how would i be able to drop 12v to the rated voltage of the intensifier tube.

    PS while i am here - i used to be signed up to an electronics forum called "Jonathan's Electronics" some years ago but all of a sudden it went down, i lost some friends when this happened, one of course was Jonathan and another i think called Shylow. if anyone knows about their where abouts i.e. another website Jonathan may have brought back up, could you let me know.

    Thanks
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,401
    2,777
    Jan 21, 2010
    Google "LM317" :)

    Sorry, I know nothing of Jonathan or Shylow.

    edit: However that web site still exists. It claims to have been last updated in 2009 though.
     
    Last edited: Nov 29, 2010
  3. neon

    neon

    1,325
    0
    Oct 21, 2006
    the lm317 is a good idea but to go cheap all you need is a series resistor to drop it to the voltage you want
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Seriously neon, you can't be serious...
    How do you propose a series resistor can put out 6.625V +/-0.125V with a varying input voltage (12-14V) and a varying (& unknown) load?
     
  5. BATEMAN

    BATEMAN

    3
    0
    Nov 29, 2010
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,401
    2,777
    Jan 21, 2010
    Yep, an LM317 will do it for you. And at that load you won't require a heatsink.
     
  7. BATEMAN

    BATEMAN

    3
    0
    Nov 29, 2010
    Thank you, ill build it up on a bread board and see how it goes.
     
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