Difference between revisions of "Lab 13 TF EIM"

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[[Media:2N3906.pdf]]
 
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=Transistor circuit=
 
=Transistor circuit=

Revision as of 01:07, 8 March 2011

DC Transistor Curves


Media:2N3906.pdf

2N3906 PinOuts.png

Transistor circuit

  1. Identify the type (n-p-n or p-n-p) of transistor you are using.



  1. Construct the circuit below according to the type of transistor you have.
  2. Measure the emitter current I_E for several values of V_{CE} by changing V_{CC} such that the base current [math]I_B = 2 \mu[/math] A is constant. [math]I_B \approx \frac{V_{bb}-V_{BE}}{R_B}[/math]
  3. Repeat the previous measurements for [math]I_B \approx 5 \mbox{ and } 10 \mu[/math] A. Remember to keep [math]I_CV_{CE} \lt P_{max}[/math] so the transistor doesn't burn out
  4. Graph [math]I_C[/math] -vs- [math]V_{CE}[/math] for each value of [math]I_B[/math] and [math]V_{CC}[/math] above. (40 pnts)
  5. Draw the [math]P_{max}[/math] curve on the above graph shading in the forbidden region.(10 pnts)

Questions

  1. What is [math]h_{FE}[/math] or [math]\beta[/math] for the transistor? (10 pnts)
  2. What is [math]\alpha[/math] for the transistor?(10 pnts)
  3. The base must always be more _________(________) than the emitter for a npn (pnp)transistor to conduct I_C.(10 pnts)
  4. For a transistor to conduct I_C the base-emitter junction must be ___________ biased.(10 pnts)
  5. For a transistor to conduct I_C the collector-base junction must be ___________ biased.(10 pnts)


Forest_Electronic_Instrumentation_and_Measurement