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A Level     Communication     Cell Phones     FDM     >Infrared<     Media     TDM    

Communication Infrared


Site for Eduqas/WJEC - Go to the AQA site.

  A Level    Communication  0 of 35    Question 791    Celular Networks 
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Deadline not set13 of 35    Question 1066    Generalised Communication System 
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Deadline not set31 of 35    Question 920    Transmission Media 
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Deadline not set35 of 35    Question 714    Transmission Media 
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Analogue Infra-Red AM Transmitter

Infrared AM Transmitter

Infra-Red Transmitter

Using a mobile phone camera to "see" infra-red

Photo of an Infrared LED

Analogue Infra-Red AM Receiver

Infrared AM Receiver

Infrared AM Receiver Circuit Diagram

This circuit produced little noise or hiss as long as all the lights were turned off. The fluorescent lights were the worst for noise generation.

Media - Using Lenses to Improve Efficiency

Alternative AM Transmitter

This uses a summing amplifier to combine the two stereo inputs into one monophonic infrared beam. The input resistance is 47kΩ which matches most audio line devices.

Summing Amplifier Infrared Transmitter

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