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EE-3 Small Signal Amplification Factor
of a Transistor
The “Experiment Corner: Finding the small signal current amplification ratio h fe of a transis-
tor” in JIKKYO SHUPPAN Co., Ltd. “DENSHI KISO (NEW EDITION) 719” provides a practi-
cal example of using a graphic calculator. Since the functions used are limited to basic
operations, they can be incorporated into an actual classroom setting quite easily.
Worksheets are provided to allow the experiment to be performed in the classroom.
Worksheets include information about how to use a graphic calculator as the experiment
progresses.
Objective
Experiment Corner:
Finding the small signal current amplification ratio h fe of a transistor
1. About transistor names
The following are the names of the transistor we will be using for this experiment:
2SC1815 and 2SD1763.
Write the meanings of these symbols (numbers).
2. Connecting devices
Connect the variable resistor VR, 10kΩ resistor, DC ammeter, transistor, and battery as
shown in the circuit diagram below.
10kΩ
VR
1MΩ
TR
E
B
mA
µA
9V
C
Connection Precautions
• Make sure your connect the
transistors collector, base, and
emitter correctly.
• Make sure you orient the
battery’s positive and negative
poles correctly.
• Set the variable resistor to its
maximum resistance value.
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