A sea of electromagnetic noise surrounds humanity, coming from countless electrical devices. Have you ever been curious about that noise? For my competition entry, I’ll show you how to build a simple EM detector so that you can listen in and learn more about your environment. The circuit will require:
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1x LM393 voltage comparator IC
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2x 1M ohm resistors
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1x 1K ohm potentiometer
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1x 10K ohm potentiometer
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1x Battery pack
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wires
In the following video, I will show you how to build the circuit, explain how it works, give a demo, and perform my signal presentation.
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DAB
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