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    jo_mahma's Avatar
    jo_mahma Posts: 2, Reputation: 1
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    #1

    Mar 4, 2010, 11:34 AM
    How to reduce 12volts to 5 volts dc
    I need to covert 12vdc from lead storage battery to 5.0 vdc for use as a USB source. I have 7850s lying around. Will they work, and if so, will some kind soul please tell me how to do it. I'm not a total moron, just no EE.

    Thanks Much
    Jm
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Oct 17, 2010, 10:07 AM

    Old post, just saw it, I think you mean a 7805, 78 meaning a positive regulator, the 79 is a negative voltage regulator. 05 is the voltage.
    :http://www.electro-tech-online.com/a...ted_lm7805.png
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