[LAU] Re: [linux-audio-user] Create high-pitch noises like the mosquito device

Ken Restivo ken at restivo.org
Tue Apr 3 12:14:18 EDT 2007


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On Tue, Apr 03, 2007 at 11:52:03AM -0400, listreader wrote:
> Robin Gareus wrote:
> >If you've got some more time to
> >exercise, it's easy to do a hardware implementation - it's called
> >"astable multivibrator" take a battery, two Transistors a Cap and few
> >Resistors,... - eg. http://en.wikipedia.org/wiki/Multivibrator - for a
> >more professional approach, follow the NE555 IC idea. radio-shack sells
> >those..
> >
> >If you want to get into making annoying noises: try to modulate
> >some high-freq. osc. - there are various tools to generate/synth sounds
> >on linux..
> >http://apps.linuxaudio.org/apps/categories/software_sound_synthesis_and_music_composition_packages
> >depending on your flavor try spiralsynthmodular, pure-data,
> >supercollider, or a dog-whistle + old hair-dryer approach ;) - There is
> >also the possibility of creating sick-feelings with some  <16Hz sounds -
> >they don't exactly qualify the subject, but are IMHO more interesting.
> >
> 
> This stuff is great.  I know that this isn't "linux" related, but i bought 
> a couple if 555 IC as per the previous suggestion to make a high pitched 
> siren.
> 
> Next I'll move on to the following suggestion ... "makes you need to go 
> poop ... now" noises.  This 555 thing will take me a while, i need to brush 
> up onmy soldering skills.
> 

That's an urban myth:

http://en.wikipedia.org/wiki/Brown_note

- -ken
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