2006-08-03 17:27:45 · 5 answers · asked by sarika 1 in Science & Mathematics ➔ Engineering
its like i want ot do a project.n i'm not sure how to use it n apply.
2006-08-03 17:40:24 · update #1
Anything in particular? If not, THANKS FOR 2 POINTS!
2006-08-03 17:31:37 · answer #1 · answered by jihad_against_muslims 3 · 0⤊ 0⤋
Ultrasonics is just high frequency audio. At one time, some TV remotes operated in that fashion. Zenith used tuning forks of different lengths to get three functions, on/off, ch. change and volume control. Unfortunately, the dog walking across the room could change channels with the click of his dog tags. RCA was the next, using an ultrasonic oscillator who's frequency could be changed by switching in different values of capacitors for the different functions. In both cases, they used two transducers to pass the information across the room, one in the remote transmitter and the other in the remote receiver in the TV. With the advent of IR leds and photo transistors (which are many times more efficient) the ultrasonic idea has given way to optical coupling.
2006-08-04 00:54:52 · answer #2 · answered by Dusty 7 · 0⤊ 0⤋
You can get ultrasonic transducers from electronic supply companies such as Allied or Newark. You can find a brief description of them here: http://en.wikipedia.org/wiki/Ultrasonic_transducer
and here: http://en.wikipedia.org/wiki/Piezoelectricity Radio Shack may have ultrasonic send/receive kits. Do a google search.
2006-08-04 00:48:29 · answer #3 · answered by gp4rts 7 · 0⤊ 0⤋
here are some ideas for you to look over friend.
Now I;\'m going to have to do the same, since I got side tracked.
especially the magazine at efymag.com never seen that one before. Talk to you later
2006-08-04 00:58:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋
They send and detect soundwaves, basically they are just a high range speaker and microphone.
2006-08-04 00:32:02 · answer #5 · answered by Josh G 2 · 0⤊ 0⤋