Signal Generator
Produced by the National STEM Centre and the Institute of Physics, this video demonstrates the use of a signal generator to illustrate waves and sound.
The video shows how features such as frequency, amplitude and wave form can be demonstrated using a loudspeaker and an oscilloscope.
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5/5Resource author
Resource by: National STEM Centre
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The resource is part of National STEM Centre,Institute of Physics
- Physics Demonstration Films
- Signal Generator
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Comments
Very good again -- thanks for taking the time to make it! New teachers in particular will benefit from watching things like this.
To add:
Using a large demonstration speaker with an exposed cone allows pupils to *see* the speaker cone vibrating (point at ceiling and sprinkle on sand for high frequencies) and thus more concretely link sound to vibration.
Range of hearing test -- I find it fun to discretely remove one of the wires to the speaker (or just turn off the power to the sig gen) at around 22kHz. Amazing how many pupils will still have their hand in the air (claiming to be able to hear it still) as you happily carry on raising the frequency!
Request for the next batch of videos:
How about a video showing how to properly use an oscilloscope? They're pretty complicated devices, with lots of connections, settings, subtleties, etc. Could show some of the common uses of oscilloscopes in the classroom at the same time.