November 2007
Intermediate to advanced
736 pages
46h 32m
English
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MOVING-IRON CARTRIDGES
To improve tracking in the groove and achieve low distortion the mass of the cartridge parts that move the moving mass—must be lowered.
This can be done by removing the magnet from the rear of the cantilever (as in the moving magnet types) and substituting a tiny, very light, hollow piece of iron. The iron piece moves in the field of a stationary magnet, changing that field and generating a signal in the coil, Fig. 8.18.
As the armature moves toward or away from a stationary magnet pole, the reluctance (magnetic resistance) of the magnetic path changes. These cartridges are also referred to as variable-reluctance cartridges. The voltage generated is proportional to the rate of movement in the groove.
The advantages gained ...
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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.