BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 13

• Manufacturer Part Number: BL-21994-000
• Description: MIC ASSY PIEZO INSTR W/38" CABLE
• Manufacturer: Knowles Acoustics
• Series: BLr
• Type: Piezo Condenserr

Specifications of BL-21994-000

• Sensitivity: -69dB ±3dB
• Voltage - Rated: 3V
• Current: 160µA
• Size / Dimension: Circular - 12.7mm Dia x 25.4mm H
• Impedance: 4K Ohm
• Frequency: 20Hz ~ 10kHz
• Termination: Wire Leads
• Direction: Omnidirectional
• Port Location: Top
• Diameter: 12.7 mm
• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• External Diameter: 12.7mm
• Output Impedance: 4000ohm
• Length: 25.4mm
• Outer Diameter: 12.7mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Filter Type: -
• S/n Ratio: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1002; BL-1994; BL-21994; BL1994

FB SERIES
FB Series are available in metallic, flexible boom styles, which utilize a wide array of
microphone elements, giving superb noise rejection and high-frequency crossover of near
and far field responses. FB’s are utilized in a variety of aircraft audio systems and radio
communication helmets. Knowles offers customized lengths and end terminations to
meet your application needs.
PNR/PWP SERIES
PNR/PWP Series are available in plastic, rigid booms, which utilize either the WP or NR
microphone element, giving superb noise rejection and high-frequency crossover of near
and far field responses. The boom microphones are utilized in a variety of aircraft audio
systems and radio communication helmets. Knowles offers customized lengths and end
terminations to meet your application needs.
Note: All performance curves are typical
M M o o d d e e l l
FB-23511-000
FB-23225-000
FB-25946-000
FB-25624-000
M M o o d d e e l l
PNR-23539-000
PNR-23868-000
PNR-23249-000
– Boom Microphone
WP-23500-000
WP-23501-000
WP-23501-000
NR-23160-000
NR-23160-000
NR-25997-C97
NR-23160-000
Microphone
Microphone
Element
Element
– Boom Microphone
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No loss of performance after submersion in 1m water
Excellent environmental performance
Includes RF screening — meets the 2v/m test over the frequency
range 1 to 20 MHz
Metallic, double-spirally-wound, flexible booms which allow easy
adjustment and maintain the microphone in an optimum acoustic
position above the top lip, or close to the side of the mouth
4mm and 6mm diameter boom options
PWP utilizes the WP Series of electret, close-talking microphones with
the same acoustic characteristics as the NR series, but with the addition
feature of waterproofing to withstand submersion in 1m water
The housings of the NR Series and WP Series microphones are attached
to plastic tubing, which can be customized to a particular length
The overall PNR and PWP packages are extremely lightweight,
small and unobtrusive
Noise Canceling
Noise Canceling
Noise Canceling
Noise Canceling
Noise Canceling
Noise Canceling
Noise Canceling
Directivity
Directivity
SPECIALTY TRANSDUCERS – Microphones
Configuration
Configuration
Microphone
Microphone
www.knowles.com
3-WIRE
2-WIRE
2-WIRE
3-WIRE
2-WIRE
2-WIRE
2-WIRE
Nominal Boom
Diameter (mm)
Nominal Boom
Diameter (mm)
NO BOOM
4
6
4
5
4
4
Tip-To-Tip (mm)
Tip-To-Tip (mm)
Boom Length
Boom Length
N/A
160
164
163
120
130
74
6mm Threaded
Termination
Termination
Housing Only
Connector
Bare End
Bare End
Bare End
Gooseneck
(No Boom)
w/ Leads
Leads
Boom
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