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Cleaning up a voltage

Discussion in 'Electronic Basics' started by Peter, Jul 28, 2003.

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  1. Peter

    Peter Guest

    I have a voltage source that alternates between 2v and 7v. I want to
    drive a logic level Mosfet with it, so I need the input to be either
    0v or 5v. I can limit the high (not really necessary) with a zener,
    but what is a SIMPLE way to make the 2v become 0v? I am worried that
    the 2v will partially turn on the mosfet and overheat it.
     


  2. Do this:

    .. 3 x 1N4148
    ..
    .. 2 - 7V o------->|-->|-->|---+-------o 0 - 5V
    .. |
    .. |
    .. .-.
    .. | |
    .. 10k | |
    .. '-'
    .. |
    .. |
    .. ===
    .. GND

    Regards,
    Costas
    _________________________________________________
    Costas Vlachos Email:
    SPAM-TRAPPED: Please remove "-X-" before replying
     
  3. John Larkin

    John Larkin Guest

    Right, with maybe a bypass cap across the diodes if mosfet off time is
    important.

    John
     
  4. Peter

    Peter Guest

    Thanks for the idea, but will it work with a Mosfet atached to the
    output given that the gate is effectively infinite resistance? Will
    the diodes still drop the voltage?
     
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