Drive an LED direct from a PIC IO pin (ie no current limiting resistor)

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  1. - 26th June 2011, 00:27 #1
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    rmteo
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    Default Re: Drive an LED direct from a PIC IO pin (ie no current limiting resistor)

    Quote Originally Posted by HankMcSpank View Post
    ....to 'cut it off', you need to make the gate more negative.

    But obviously with the above config the the source is at ground, the only way is up so to speak (on the gate...ie if driven by a PIC) ..therefore no possiblity of turning the n fet off.....which bit am I not grasping?!
    Look up the Vgs parameter (and the typical transfer characteristics graph - IRF8714 in the example below) in the datasheet of a MOSFET for the answer.
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