3904 not inverting a square wave input at base

Discussion in 'General Electronics Chat' started by tpny, May 28, 2013.

  1. tpny

    Thread Starter Member

    May 6, 2012
    216
    0
    I have a 1hz square wave between 2V and 0V going into a 3904 at the base thru a 1.3k resistor. Collector is tied to same 2V source thru a 200ohm resistor. emitter is tied to ground. At the collector, I'm seeing a continuous 0V on the scope. It appears that the npn is always turned on even though base is alternating between 0 and 2V. I'm not seeing an inverting square wave at the collector as I would hope.. What is happening? Thanks!
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,452
    3,371
    Show us a photo of your wiring.
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    What do you mean by the "same 2V source" - presumably you don't mean the source that generates the 0-2V input to the base ...???
     
  4. tpny

    Thread Starter Member

    May 6, 2012
    216
    0
    oops! it is, my bad! ha!
     
Loading...