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> Diy "mosquito" 17.4 Khz Noise Generator, child repellent
Araya
Posted: May 26, 2010 06:47 pm
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How hard would it be to generate noise at 17.4 khz?
It's the frequency of the Mosquito, the device that only children can hear devil.gif
Just starting electronics and I thought it'd be fun to put something like this together, could anyone point me to any schematics or anything similar, thought it'd be more fun than flashing lights. Even if there aren't any plans, for future reference is it quite simple to do?
thanks smile.gif
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tekwiz
Posted: May 26, 2010 06:57 pm
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Nothing to it. Look up a circuit for a 555 tone generator & choose the timing components for your desired frequency. 555 tutorials abound on the Web.


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MacFromOK
Posted: May 26, 2010 10:18 pm
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Not sure that frequency will always be the cutoff point, as it seems to vary with individuals.

Be aware that even if the sound doesn't register in the brain, it will be creating pressure on the eardrums. So if you make it loud/intense, it can still give someone a splitting headache.

This can be demonstrated (if you're into pain and hearing loss) with a tone generator on your computer (there's a free one on our Pinned: Links! page). beer.gif


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MikeGyver
Posted: May 27, 2010 08:17 am
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Do it the easy way.

Download a software tone generator, run your (audio) line out into a powerful amplifier and power some loud tweeters (which are quite cheap online). Good for making the neighbors dogs leave the area and stop barking too. thumbsup.gif
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tekwiz
Posted: May 27, 2010 05:38 pm
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QUOTE (MikeGyver @ May 26, 2010 11:17 pm)
Do it the easy way.

Download a software tone generator, run your (audio) line out into a powerful amplifier and power some loud tweeters (which are quite cheap online). Good for making the neighbors dogs leave the area and stop barking too. thumbsup.gif

Yep, & piezo tweeters are best, as they produce more sound per watt than any other type. They cost about $2.30 apiece on eBay. I have some of them & they are definately weapons grade. I'm planning to use them for a stop barking dogs setup that should cover an entire block.


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Araya
Posted: May 28, 2010 04:53 pm
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Thanks very much, I thought it might be a complicated thing to do because the commercial device costs about 300! I'll bear in mind air pressure, didn't want to harm anyone biggrin.gif
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AdamO
Posted: May 28, 2010 07:44 pm
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QUOTE (tekwiz @ May 27, 2010 05:38 pm)
QUOTE (MikeGyver @ May 26, 2010 11:17 pm)
Do it the easy way.

Download a software tone generator, run your (audio) line out into a powerful amplifier and power some loud tweeters (which are quite cheap online). Good for making the neighbors dogs leave the area and stop barking too.  thumbsup.gif

Yep, & piezo tweeters are best, as they produce more sound per watt than any other type. They cost about $2.30 apiece on eBay. I have some of them & they are definately weapons grade. I'm planning to use them for a stop barking dogs setup that should cover an entire block.

You think that would silence barking dogs? Seems to me like it would make 'em bark more (annoying them and such). Hey, lemme know if you are successful because we've got some neighbors that keep (and neglect, IMO) a gaggle of little dogs in their yard and I wouldn't mind quieting those little muts sometimes.

-Adam O.
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tekwiz
Posted: May 28, 2010 08:10 pm
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QUOTE (AdamO @ May 28, 2010 10:44 am)
QUOTE (tekwiz @ May 27, 2010 05:38 pm)
QUOTE (MikeGyver @ May 26, 2010 11:17 pm)
Do it the easy way.

Download a software tone generator, run your (audio) line out into a powerful amplifier and power some loud tweeters (which are quite cheap online). Good for making the neighbors dogs leave the area and stop barking too. thumbsup.gif

Yep, & piezo tweeters are best, as they produce more sound per watt than any other type. They cost about $2.30 apiece on eBay. I have some of them & they are definately weapons grade. I'm planning to use them for a stop barking dogs setup that should cover an entire block.

You think that would silence barking dogs? Seems to me like it would make 'em bark more (annoying them and such). Hey, lemme know if you are successful because we've got some neighbors that keep (and neglect, IMO) a gaggle of little dogs in their yard and I wouldn't mind quieting those little muts sometimes.

-Adam O.

I plan to fire mine for a short period every time I hear a dog bark nearby. I figure if the sound is loud enough to bother their ears, it shouldn't take long to condition them against barking unnecessarily. A really horrible sounding modulation should also help.


--------------------
Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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CWB
Posted: May 28, 2010 11:43 pm
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QUOTE (AdamO @ May 28, 2010 01:44 pm)
QUOTE (tekwiz @ May 27, 2010 05:38 pm)
QUOTE (MikeGyver @ May 26, 2010 11:17 pm)
Do it the easy way.

Download a software tone generator, run your (audio) line out into a powerful amplifier and power some loud tweeters (which are quite cheap online). Good for making the neighbors dogs leave the area and stop barking too. thumbsup.gif

Yep, & piezo tweeters are best, as they produce more sound per watt than any other type. They cost about $2.30 apiece on eBay. I have some of them & they are definately weapons grade. I'm planning to use them for a stop barking dogs setup that should cover an entire block.

You think that would silence barking dogs? Seems to me like it would make 'em bark more (annoying them and such). Hey, lemme know if you are successful because we've got some neighbors that keep (and neglect, IMO) a gaggle of little dogs in their yard and I wouldn't mind quieting those little muts sometimes.

-Adam O.

sounds like they're juuussst about the right size for the BBQ !
throw the bones on the neighbor's steps ... he'll get the idea .
laugh.gif


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MacFromOK
Posted: May 29, 2010 01:52 am
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Gotta admit BBQ sauce does hide a multitude of (off) flavors. laugh.gif


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