November 2007
Intermediate to advanced
736 pages
46h 32m
English
Content preview from Consumer Electronics
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DYNAMIC LOUDSPEAKERS
There are two varieties of dynamic loudspeakers : electrodynamic and permanent magnet (PM) speakers. Both work in exactly the same way, the difference is in their construction.
The electrodynamic speaker has a soft iron magnetic circuit, non-retentive of magnetism, around whose centre leg, a large, multilayer field coil is wound, as shown in Fig. 4.7. When dc flows through this field coil, it magnetises the iron core. A magnetic flux field directly proportional to the strength of the current through the coil is thus set up across the airgap. The iron core is not permanently magnetised, it stays magnetised only as long as current flows through the field coil.
Fig. 4.6 A two-way electrostatic utilising a separate woofer ...
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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.
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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.