Which lamps are alight?

Discussion in 'General Electronics Chat' started by sandraos, Jun 10, 2009.

  1. sandraos

    Thread Starter Member

    Jun 8, 2009
    12
    0
    I've seen this diode puzzle all over the net. No one has provided an answer. The curiosity is killing me.
    My guess is LP1 LP2 LP3 for the image on the left and LP3 LP4 from the image on the right.
    btw, electronics noob here.
     
  2. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    Given no other information, I think those are the only ones that could be on.
     
  3. kammenos

    Active Member

    Aug 3, 2008
    127
    0
    that would be correct
     
  4. David Bridgen

    Senior Member

    Feb 10, 2005
    278
    0
    In the left hand circuit, LP1 would be on at full brilliance, and LP2 + LP3 on at reduced brilliance.

    I the right hand circuit LP3 and LP4 would be on at reduced brilliance.
     
  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,039
    287
    This question is actually on the GROL license exam. :)
     
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