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

    Member

    Feb 6, 2013
    111
    7
    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
    16,283
    6,795
    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
    3,531
    675
    ...or a depletion-mode MOSFET, just don't accidentally enhance it...
     
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