November 2007
Intermediate to advanced
736 pages
46h 32m
English
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MOVING-IRON HEADPHONES
The so-called magnetic type (moving iron) headphones use the same basic principle as was originally adopted for telephone earpieces or receivers. As shown in Fig. 3.6 a thin flexible soft iron diaphragm is supported by the casing just clear of the tips of two soft iron pole-pieces which are attached, in turn, to a small permanent magnet. Magnetic attraction causes the diaphragm to be distended slightly towards the pole tips, while still leaving a clearance of something less than a half-millimeter.
The incoming audio current passes through coils wound around the pole-pieces. In the presence of an audio signal the varying magnetic field created by the current interacts with that from the permanent magnet, varying the pull ...
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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.