Power on-off circuit

Discussion in 'General Electronics Chat' started by ericmar, Jul 21, 2008.

  1. ericmar

    Thread Starter New Member

    May 16, 2008
    6
    0
    Hi,

    I am thinking of building a pure hardware power on-off circuit using power mosfet. I found a circuit (see below) from the web and tried it with little change (using NDT456P rather than IRF9540 and 2N7002 rather than 2N7000) but it does not work somehow. I wonder if anyone has better idea.

    [​IMG]

    Thanks.

    Regards,
    Eric
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Since R5 is *'d, what's the resistance? And, do you have the URL for the site where you got the schematic?

    Ken
     
  3. Jeepster

    New Member

    Jun 12, 2008
    5
    0
    Best advice I can give is to simulate the result with a spice simulator... Try free SwitcherCAD III from Linear Tech.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The symbol for the N-channel Mosfet is wrong on the schematic.
     
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