Simple demonstration to show mobile phones
generate radio frequencies (RF)

When you put the loop near to a mobile, that is texting or making a call, the LED will light / flash as data is being sent.
The radio waves created by the mobile phone pass through the loop (black wire in photo) inducing a current large enough to light the LED.


RF from mobile phone

Left shows the bare 3D printed former. Right shows the former with components assembled
(three screws and washers hold the wires from the wire loop (black), the OA91 diode and the LED)


RF from mobile phone


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THE CREATIVE SCIENCE CENTRE


Dr Jonathan Hare University of Sussex, Brighton.
e-mail: j.p.hare@sussex.ac.uk

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