Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

High power schmitt trigger

  1. Oct 17, 2007 #1

    I'm looking for inexpensive schmitt trigger that has variable trigger points (30v - 50v) and that will handle max current of about 3A. I would very much appreciate your pointers.

    Are there schmitt triggers that triggers at certain negative voltage? (for example, does not trigger at -39v but triggers at -40v)
  2. jcsd
  3. Oct 17, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    An op-amp can be wired as a schmitt trigger.
  4. Oct 18, 2007 #3


    User Avatar

    Staff: Mentor

    That is something that you should make out of discrete transistors that will handle the voltages and currents that you specify. Do you want a differential input or a single-ended input? You will basically build up the basic circuits of an opamp/comparator (as NoTime says), and close a positive feedback loop to give you the Schmidt trigger hysteresis characteristic that you want. If you are more specific in your requirements, we can suggest some circuit topologies for you to consider and experiment with.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: High power schmitt trigger
  1. Schmitt triggers (Replies: 14)