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We develop a novel MEMS microphone with a wide dynamic range. The microphone has two channels and consists of two condensers, a single diaphragm and a backplate. Each channel has a different role. The Normal channel has higher sensitivity and an intermediate dynamic range, whereas the High channel has lower sensitivity and a higher dynamic range. By switching the two channels to correspond to sound...
Compression bonded magnets were manufactured using melt-spun ribbons of Nd11Fe72Co8B7.5V1.5, MQP-B and MQP-D (GM Co., Ltd.). The magnetic field and temperature dependences of the magnetic aftereffect constant (Sv) which determines the magnetic stability were studied. Compared with bonded magnets based on MQ powders, Nd11Fe72Co8B7.5V1.5 bonded magnets had a larger (BH)max but a smaller Sv (2.3 kA/m)...
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