School of Physics Lecture Demonstration Manual

Ei-4 Amplitude Modulation

Published: Tuesday 14 March 2006 - Updated: Tuesday 29 March 2011

Aim

To demonstrate the carrier and amplitude modulated waveforms present in a radio receiver.

Apparatus

Diagrams

Click on pictures to enlarge.

Amp Mod Diagram

Description

The oscilloscope is operated in its dual channel mode with the probes connected to the base of the transistors marked with white out. The chassis serves as an earth for both probes. One channel displays the modulated carrier wave while the second, the audio signal.

Safety notes

Electrical safety 

Maintenance 

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