Tag Archives: 17 KHz

High-pitched Noisemaker

For those of you in high school or college, I just made your day. This little device, found on Instructables, emits a 17KHz high-pitched tone that’s undetectable to most people over the age of 30. It sounds similar to a ‘mosquito’ ringtone on a cellphone and will drive your classmates and/or teacher NUTS. Just rig up the circuitry and the ...

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