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

Results 1 to 24 of 24

Threaded View

  1. - 26th June 2011, 00:27 #23
    rmteo's Avatar
    rmteo
    rmteo is offline Senior Member
    Join Date
    May 2007
    Posts
    604

    Did you find this post helpful? Yes | No

    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.
    Attached Images Attached Images  
    Why pay for overpriced toys when you can have
    professional grade tools for FREE!!!
« Previous Thread | Next Thread »

Members who have read this thread : 0

You do not have permission to view the list of names.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules