Transistor Amplifier CE

The experiment to draw the transistor characteristics can be modified to convert it into a common emitter amplifier. All we need to do is to make a potential divider network to reduce the amplitude of WG to a value less than 80mV. This reduced output is connected to the base through a 1uF capacitor.

Objective Demonstrates the amplifier action of an NPN transistor in the common emitter configuration.

Procedure

_images/transistor-amplifier.svg

The output is shown below. It can be seen that the input and output signals are 180 degree out of phase.

_images/transistor-amplifier-screen.png

Discussion

The base current is set the PV2 voltage applied via the 100~k\Omega resistor. This sets DC operating point of the circuit.Choose this to get minimum distortion in the output.