November 2007
Intermediate to advanced
736 pages
46h 32m
English
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ULTRASONIC TRANSDUCERS
The operation of an acoustic type remote control system depends upon the use of transducers. One transducer in the transmitter, i.e. in the hand-held remote control unit, converts a mechanical vibration into high-frequency sounds. Another transducer in the receiver converts the high-frequency sounds into electrical signals which can be used for operating a control in the receiver.
Two basic transmitter types are used. The first is the mechanical or “bonger type” which employs a cylindrical aluminium rod which vibrates in its longitudinal mode when struck. If such a rod is struck on one end by a hammer moving along its axis, it emits a sustained note which has a definite frequency. For example, an aluminium rod 2½” long ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.