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Knowles accelerometers - BU Series (7.87x5.54 mm)

buThe BU Series piezo-ceramic accelerometer has output from 20 Hz to above 10 kHz, and is used primarily as a contact microphone for high noise environments. It may also be used as an accelerometer with lightweight structures.

As a contact microphone, the BU may be worn on the throat, or touching a bony part of the head (top, temple, or mastoid bone).
BU has been integrated into helmet designs for radio communication for military and emergency services.

Key features:

    • Ceramic vibration transducer
    • High vibration sensitivity
    • Small size
    • Wide frequency range
    • Integral FET amplifier
    • High resistance to mechanical shock
    • Withstands severe environmental conditions


Below the BU serie models :

 Model Picture Thickness Sensitivity @1KHz DC Supply (Vdc) Max. Current Drain (uA) Nom. Output Imp. @1KHz (Ω) "A" Weighted Noise (dBre. 1V)
BU-21771-000 BU-21771-000 4.06 -45.0±4.5 1.5 50 5200 -103
BU-23173-000 BU-23173-000 4.06 -39.0±4.5 1.5 50 5200 -103
BU-23842-000 BU-23842-000 2.24 -40.0±4.0 1.5 50 5200 -103
BU-27135-000 BU-27135-000 2.24 -45.0±4.5 1.5 300 5200 -103
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