Need desperate help on BJTs

Discussion in 'Homework Help' started by iflabs, Nov 28, 2006.

  1. iflabs

    Thread Starter New Member

    Sep 14, 2006
    6
    0
    I'm having trouble in lab of my course and this post is my last hope. I just spent three hours trying to figure out how to measure Base Current, Collector-Emitter Voltage, and Collector Current with a 2N3904 transistor on a breadboard. The three hours were wasted as I came out with no results.

    Here's the lab for reference (LAB 6 page 12 and 13 of the following link):
    http://www.ece.umn.edu/class/ee2002/EE2002 Lab Manual_1.doc

    Worst of all, I have will have a quiz on BJTs. Could someone draw wiring diagrams on a beardboard with a 2N3904 transistor that measures the following? I'm speaking of a common-emitter configuration.

    Base Current
    Collector-Emitter Voltage
    Collector Current
    Collector Voltage (is this the same as Collector-Emitter Voltage?)
    Small Signal Beta

    If you were measuring Collector Current versus Collector-Emitter voltage for a fixed Base Current, does that mean you supply a voltage to the Base lead of the transistor (therefore giving it fixed current), then apply several different voltages to the Collector-Emitter leads and record down both the Collector Current and Collector-Emitter Voltage?

    I would also like to know how you would go about measuring the voltage/current gain of a simple transistor.

    Definitely appreciate the help and would kill for it.:D
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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