Solid State devices

Module 3 Lab Exercise: Determine Beta for BJTs

Wire the circuit shown, with Rc = 470 Ω and Q = 2N3904

· Record Ib and Ic in the table below for the given values of RB

· Calculate the base current IB from (9 V - Vbe)/RB

· Start with RB = 1 Mohm, then continue with the RB values.

(A) Squeeze the transistor between your fingers to raise the case temperature, record any change in collector current _______

(B) Put a piece of ice in a plastic bag and hold it on the transistor to reduce the case temperature, record any change in collector current __________

· Describe your perception of the relationship between Beta and case temperature.

· Describe the behavior of Beta vs Ic

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