How does mosquito repeller work and how does it produce sound without speakers?

@mayur-20q8of • Oct 26, 2024

Oct 26, 2024

1.4K

in the mosquito repeller we are using buzzer which is just made up of brass

my question is how it is producing the sound without speaker and any other device?
it is directly connected to transistor
what is the phenomena behind it's working?

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Abhishek Rawal

@abhishek-fg9tRh • Mar 22, 2013

Transistors are used to amplify the signals.The output of Amplifier is given to buzzer & it produces ultrasonic soundwaves.
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[Prototype]

@prototype-G9Gn5k • Mar 22, 2013

Human ears are only sensitive to the sound range of 20 hz to 20 Khz. Anything above or below is not audible to us. No speakers doesn't means no sound. Every frequency produces a sound. You're surrounded immense "noise" around you.

I am not quite sure about the mosquito thing but its seems that those repellent produce a high frequency signal which might not be liked by the mosquito, however, being outside our audible range, we can't hear anything while it might be as irritating as someone scratching a board for mosquitoes. This is just a wild guess, I don't exactly know if this is the exact case.
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lal

@lal-R60Xjx • Mar 22, 2013

Well, if your mosquito repller is making sound and you can hear it, then it is probably a fake. As prototype said above, those devices are meant to produce ultrasonic waves beyond the audible range of humans. Usually, piezo electric crsytals are made use of to produce ultrasonic waves. And these waves won't be detected by human ear.
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aakash.kaasina

@aakashkaasina-Qk1ugh • Mar 27, 2013

Abhishek Rawal
Transistors are used to amplify the signals.The output of Amplifier is given to buzzer & it produces ultrasonic soundwaves.
what i heard is like they aren't that much useful....dont know if it is true or not
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