rcte2q@jetson.uh.edu (04/16/91)
I have heard this story some several sources.... An E.E., who hates loud music, builds a device that can cause a stereo system to self destruct. When teens pull alongside his car with their subwoofers kickin', all it takes is a push of a button, and the sonic pollution is stifled.... My question is, is this a B.S. urban legend or not? I would think that, since many power amps are designed with a wide bandwidth, all it would take is a sufficiently strong ultrasonic signal to overload the amp... which begs the question, how would one inject souch a signal into a stereo system 10 feet away from you... Just something to ponder over. --l.liska, UofH
lrk@k5qwb.lonestar.org (Lyn R. Kennedy) (04/17/91)
rcte2q@jetson.uh.edu writes: > I have heard this story some several sources.... An E.E., who hates loud musi > builds a device that can cause a stereo system to self destruct. When teens > pull alongside his car with their subwoofers kickin', all it takes is a push > a button, and the sonic pollution is stifled.... > > My question is, is this a B.S. urban legend or not? > > I would think that, since many power amps are designed with a wide bandwidth, > all it would take is a sufficiently strong ultrasonic signal to overload the > amp... which begs the question, how would one inject souch a signal into a > stereo system 10 feet away from you... > > Just something to ponder over. > > --l.liska, UofH If he's listening to the radio you could inject a signal there. I think a 20 Hz square wave on FM would be exciting. If he's using the tape or CD it still might be possible using an AM transmitter. Reminds me of the good-ole-days on 80 meters. Pull in to the Dairy Queen and place your order over the jukebox........ ------------------------------------------------------------------------- lrk@k5qwb.lonestar.org lrk@k5qwb.UUCP 73, utacfd.utarl.edu!letni!rwsys!kf5iw!k5qwb!lrk Lyn Kennedy K5QWB @ N5LDD.#NTX.TX.US.NA P.O. Box 5133, Ovilla, TX, USA 75154 -------- "We have met the enemy and they are us." Pogo -----------------
whos@ddsw1.MCS.COM (Ben Feen) (04/21/91)
rcte2q@jetson.uh.edu writes: >I have heard this story some several sources.... An E.E., who hates loud music, >builds a device that can cause a stereo system to self destruct. When teens >pull alongside his car with their subwoofers kickin', all it takes is a push of >a button, and the sonic pollution is stifled.... >My question is, is this a B.S. urban legend or not? It could be done, maybe, perhaps, I guess, if you sent a signal of extremely high amplitude out on the frequency of the station the kids are listening to... The speaker's coil would become a coil gun and shoot the cone 40 feet away... -- whos@ddsw1.MCS.COM | I don't know, who's at DDSW1? | whos@ddsw1.MCS.COM! I asked YOU who's at DDSW1! Ok, there's a guy at DDSW1, right? | Right! Who? | Exactly! | What? | No, he's at lll-winken. | Where? | No, What! | I don't know! | He's at gargoyle. | Who? | No, he's at DDSW1.MCS.COM!
gt0869a@prism.gatech.EDU (WATERS,CLYDE GORDON) (04/22/91)
In article <1991Apr21.051154.18708@ddsw1.MCS.COM> whos@ddsw1.MCS.COM (Ben Feen) writes: >rcte2q@jetson.uh.edu writes: > >>I have heard this story some several sources.... An E.E., who hates loud music, >>builds a device that can cause a stereo system to self destruct. When teens >>pull alongside his car with their subwoofers kickin', all it takes is a push of >>a button, and the sonic pollution is stifled.... > >>My question is, is this a B.S. urban legend or not? Legend or not, this would probably require the broadcast of EXTREMELY high levels of radio frequency, thus being most lokely ILLEGAL. You also would not only destroy the one offender, but also anyone else tuned in to the same frequency. I would hate to be you if anyone found out( visions of brickbats and Uzis fill my head). As for direct injection into the system wiring- notvery likely- most amps are wired with shielded cable , usually of GREATER shield percentage than most RF applications since internal noise in the car is such a problem with stereo installation. Moral: it most likely won't work, and heaven forbid if anyone found out if you managed to do it(jail, fines, broken bones, death, etc.) note: the abive should be taken with a few :-) if it is not already obvious. My$.02 Gordon. -- WATERS,CLYDE GORDON-Georgia Institute of Technology Atlanta Ga 30332 ******<LANGUAGE IS A VIRUS! - Laurie Anderson-Home of the Brave>******* uucp: ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt0869a Internet: gt0869a@prism.gatech.edu
dag@hp-lsd.COS.HP.COM (David Geiser) (04/24/91)
You don't need to destroy it to have fun. It's pretty easy to make it wail like a mashed cat. dag "Keep the smirk off your face for self-protection."