On Fri, Mar 30, 2007 at 03:40:55PM -0800, Tim Howard wrote: > On 3/30/07, listreader <listreader@xxxxxxxxxxx> wrote: > >I saw the mosquito device that will annoy younger > >people, but not older people: > > http://www.compoundsecurity.co.uk/teenage_control_products.html > > > >Its pretty expensive. How would I begin to create that > >from scratch? Can a sound-card generate those frequencies? As pointed out by Tim below, it shouldn't be expensive. This thing seems to be targeted to people with enough money and holding strange opinions. To quote the web page: "Anti social behavior has become the biggest threat to private property over the last decade and there has been no effective deterrent until now." As if you could solve this by a 'deterrent'. If I were an "anti-social teenager" I'd keep my iPod earphones in place and be immune to this gadget. The even more anti- social would probably use a paint spray to disable the thing in seconds. I wouldn't blame them for doing so. > It would likely be easiest to just make an electronic device like the > one in the article... Use a 555 timer (or other simple oscillator) > hooked up to a small audio amp, then to a tweeter. That's indeed all it should take. Total component cost around $15 or even less. -- FA Follie! Follie! Delirio vano è questo !
