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Knowles ST microphones - BL Series

BLKnowles’ Piezo Ceramic Microphones (BL Series) are rugged, stable and versatile.
BL microphones are available in three different package sizes: standard, thin or 0.5" cylindrical shell and cable assembly. Both communication and broadband frequency response versions are offered. In addition, BL microphones have high vibration sensitivity and may be used as accelerometers.

    • High sensitivity
    • Wide frequency range
    • Integral FET amplifier
    • High resistance to mechanical shock
    • Various responses
    • Two case sizes available
 Model Picture Dimensions (mm) Sensitivity @ 1kHz DC Supply (Vdc) Max. Ampli. Current Drain (uA) "A" Weighted Noise Nom. Output Imp. (Ω) Comments
BL-21671-000 BL-21671-000 7.87 x 5.54 x 4.06 -54.0±3 1.3 50 32.0 dB 13000 Standard Response
BL-21671-140 BL-21671-140 7.87 x 5.84 x 4.06 -54.0±4 1.3 50 32.0 dB 13000 Faster Overpressure Recovery Standard Response
BL-21785-000 BL-21785-000 7.87 x 5.54 x 2.24 -69.0±3 3 160 34.0 dB 4000 Broadband Response
BL-21994-000 BL-21994-000 25.5 -69.0±3 3 160 34.0 dB 4000 965mm Shielded Cable Broadband Response
BL-23497-000 BL-23497-000 25.5 -69.0±3 3 160 34.0 dB 4000 34.3mm Leads Broadband Response
BL-27046-000 BL-27046-000 7.87 x 5.54 x 2.24 -69.0±3 1.3 160 34.0 dB 4000 Broadband Response
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