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Switch design with MOSFETs

Discussion in 'General Electronics Discussion' started by Sigmoid, Jul 24, 2013.

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  1. Sigmoid

    Sigmoid

    7
    0
    Jul 21, 2013
    Hey,

    I'm trying to figure out the principles of using MOSFETs as simple on-off switches.

    The intended function of this design is to convert a standard, garden variety three terminal ON/OFF/ON switch into an incremental (zero/one/two) switch.

    At one extremity (A on) no lights are on. In the middle (off) position the right light comes on. In the top (B on) position both lights are lit.

    mosfet.png

    Did I get MOSFETs right? Or would there be a better way of solving this? Are the megohm resistors a good choice?
     
    Last edited: Jul 24, 2013
  2. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    Megohm resistors are OK.

    Just make sure that the FETs can stand 24V on their gates with some leeway.
     
  3. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    I would go with lower resistors, more like 10K for more immunity to noise.

    Bob
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    And for faster switching speed
     
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