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Need A Circuit To trigger An Event Above 2 Volts

Discussion in 'General Electronics Discussion' started by bigshop, Jun 24, 2013.

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  1. bigshop


    Jun 24, 2013
    I need a way to monitor a DC circuit so that once it reaches 2 volts I can turn on another circuit, then once it falls below 2 volts turn off that circuit
    Anybody have an example
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Google Schmitt-trigger - you will find lots of circuits.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Actually what you describe would be accomplished with a comparator.

    However, a Schmitt trigger is a better option because it will not switch rapidly back and forth when the signal is at or very close to 2V.

    For your case a comparator with a small amount of hysteresis (there's some words to Google with) would form a schmitt trigger that may solve your problem.
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