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Best choice for driving power-devices from a DIO pin?

Discussion in 'Electronic Basics' started by Jeff Dege, Dec 23, 2005.

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  1. Jeff Dege

    Jeff Dege Guest

    Suppose I have a TTL output pin, and I want to use it to switch something
    that pulls a lot of current.

    I've been driving a relay through a switching transistor. But are there
    better alternatives?

    In my ideal world, there'd be a DIP that I could control from a
    microprocessor without having to mess about with transistors, and could
    switch multi-amp current. Ideally switching fast enough that I could do
    PWM control.

    How close can we get?

    The twentieth century was one in which limits on state power were removed
    in order to let the intellectuals run with the ball, and they screwed
    everything up and turned the century into an abattoir... We Americans
    are the only ones who didn't get creamed at some point during all of
    this. We are free and prosperous because we have inherited political
    and value systems fabricated by a particular set of eighteenth-century
    intellectuals who happened to get it right. But we have lost touch with
    those intellectuals.
    - Neal Stephenson
  2. Jamie

    Jamie Guest

    they make solid state relays with
    isolation and low input voltage and
    current to operate it.
    also are the isolated photo
    Fet switches which give you low
    turn on R.
  3. Rich Grise

    Rich Grise Guest

  4. David Harmon

    David Harmon Guest

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