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

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