How are these bulbs wired?

Discussion in 'General Electronics Chat' started by ElectricMagician, May 14, 2014.

  1. ElectricMagician

    Thread Starter Member

    Jul 26, 2012
    57
    0
    Hello everybody,

    I live in a house built in the 70s. We have 2 light bulbs and 2 switches that are somewhat wired together, this is how they react to the switches:

    SW1 SW2 L1 L2
    0 0 0 0
    0 1 1 1
    1 0 1 0
    1 1 0 1


    So as you can see, L1 = SW1^SW2 and L2 = SW2

    How would these be wired in real life? I highly doubt that they used dedicated logic circuits.

    They are connected to mains electricity.

    Your input is appreciated!
     
  2. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    Like this.........................................:)
    Neatness will take more time. :(
     
  3. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    ps.

    This is a standard 3-way circuit with a bulb added to one of the "travelers".
     
    #12 and ElectricMagician like this.
  4. ElectricMagician

    Thread Starter Member

    Jul 26, 2012
    57
    0
    Very interesting!

    I kept thinking the switches were simple connect-disconnect switches which made the circuit very hard to realize.

    Thank you very much
     
  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    Nah, hard to realize (actually visualize) is when your sister moves into her new condo but the stairs lights are wired incorrectly, so you still have to go downstairs to turn them on.

    "Buzzing" a circuit that is too large to fit on a workbench to be buzzed is never fun. I must have made 100 trips up and down her stairs till I figured out how it was (incorrectly) wired and what the fix was.
     
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