In this type of design, a small magnet, as powerful as
possible, is associated with the needle-holder lever and when moving into
motion, it modifies the magnetic flux that crosses fixed coils where a current
is generated. The technical problem to overcome in this type of system is the
weight of the magnet that is associated with the lever, because, one of the
basic parameters to obtain good results is a very low mobile mass or effective.
Reducing the weight of the magnets reduces their efficiency
and therefore the output voltage. However, it is a system that provides
sufficient good results for the technological development achieved in the
manufacture of magnets. Among the manufacturers using this system are Shure,
Audiotecnica and AKG.
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