ZTX1048 transistor used as a switch

Discussion in 'General Electronics Chat' started by Shockmyselfsmart, Jan 2, 2011.

  1. Shockmyselfsmart

    Thread Starter New Member

    Dec 17, 2010
    27
    0
    Data sheet http://www.diodes.com/datasheets/ZTX1048A.pdf

    Ok i'm trying to use this transistor as a switch. I have the collector hooked to 5 volts the emitter hooked to a noid light and the base hooked to a 555 timer threw a 1k ohm resistor.

    I can see the noid light get dim and lite but never turned off. I read 2.3 volts then to 4.8 volts.

    Why cant I get a reading all the way to 0 volts? Do I need a bigger resistor in line with the base?

    No real purpose behind this just playing around with my bread board trying to figure out how all this stuff works.

    If i plug my noid light off the 555 i have lite and no lite.
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Connect emitter to gnd and noid light to collector.
    Then add resistor 1K between base and gnd.
     
  3. Shockmyselfsmart

    Thread Starter New Member

    Dec 17, 2010
    27
    0
    O did I get it backwards lol?

    Wait you are saying 5v to noid light then noid light to collector ok.
     
    Last edited: Jan 2, 2011
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