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FET Help

Discussion in 'General Electronics Chat' started by arthur92710, Dec 1, 2007.

  1. arthur92710

    Thread Starter Active Member

    Jun 25, 2007
    307
    1
    I have a IRF540 FET and i need it to be switched on and off with a 555. It will power something that needs more current then the 555 can out put so the Fet drain and source will be connected directly to the battery. But when i do this it does not work right. It looks like the 555 is powering the led and not the 555.
    I tried various configurations of the pins but they all work the same way.:confused: Can you help?

    video
     
  2. hgmjr

    Retired Moderator

    Jan 28, 2005
    9,029
    219
    Can you provide a diagram of the circuit?

    hgmjr
     
  3. arthur92710

    Thread Starter Active Member

    Jun 25, 2007
    307
    1
    Sure it the same one I posted in a different post. Here
     
  4. hgmjr

    Retired Moderator

    Jan 28, 2005
    9,029
    219
    I watched the video you provided and I observe what you are talking about.

    I wonder if your FET has been damaged perhaps. ESD perhaps has done it in.

    hgmjr
     
  5. arthur92710

    Thread Starter Active Member

    Jun 25, 2007
    307
    1
    OK ill try another fet

    ok a new fet helped
     
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