electronic nc switch

Discussion in 'General Electronics Chat' started by z3ngew, Apr 22, 2013.

  1. z3ngew

    Thread Starter New Member

    Apr 18, 2013
    13
    0
    Hello every one,
    Is there an electronic component that can behave like normally closed switch?

    Thanks in advance,
    z3ngew
     
  2. sjgallagher2

    Active Member

    Feb 6, 2013
    128
    12
    An NPN transistor connected to ground. When current runs through the base, all circuit current goes to the ground instead of wherever else it will go. I can sketch a circuit if you'd like! Also, for a more user friendly idea, a digital Inverter. When input is 1 output is 0 and vice versa.
     
  3. #12

    Expert

    Nov 30, 2010
    18,093
    9,682
    Based on no information about the amount of voltage, current, or impedance, a jfet is normally on until you turn it off with the proper bias.
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
    3,527
    679
    ...or a depletion-mode MOSFET, just don't accidentally enhance it...
     
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