MR-23151-000 Knowles Acoustics, MR-23151-000 Datasheet - Page 27
![MIC MAGNETIC 50' SUBMERSIBLE](/photos/0/4/461/mr-23151_sml.jpg)
MR-23151-000
Manufacturer Part Number
MR-23151-000
Description
MIC MAGNETIC 50' SUBMERSIBLE
Manufacturer
Knowles Acoustics
Series
MRr
Type
Magnetic, Waterproofr
Specifications of MR-23151-000
Sensitivity
-87.5dB ±3dB
Size / Dimension
Circular - 22.12mm Dia x 9.3mm H
Impedance
300 Ohm
Frequency
280Hz ~ 5kHz
Termination
Wire Leads
Direction
Omnidirectional
Port Location
Side
Directional Properties
Omnidirectional
Operating Voltage
1.3 V
Termination Style
Wire Leads
Dimensions
9.3 mm L
Diameter
22.12 mm
Length
9.3 mm
Transducer Function
Microphone
Device Type
Microphone
Directivity
Omni
External Diameter
22.12mm
Output Impedance
300ohm
Drain Current Max
50µA
Terminal Type
Wire Leads
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Filter Type
-
S/n Ratio
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
423-1015
MR-23151
MR-3151
MR3151
MR-23151
MR-3151
MR3151
MICROPHONE AND SPEAKER BASICS
SPEAKERS
The speaker converts an electrical signal into sound. A cross section of a typical Knowles speaker is shown in Fig. 3.
The basic components of the speaker are: a coil of wire, a metal U-shaped reed called the armature, a pair of permanent
magnets, a drive rod, and a diaphragm.
The coil and armature act as an electromagnet. An alternating current in the coil causes the polarity of the armature to
switch back and forth from north to south. The free end of the armature bends slightly up and down as it is attracted
alternately to the top and bottom magnets (Fig. 4). The diaphragm, pulled along by the drive rod, pumps air in and out of
the speaker. The mechanical motion of the armature is thus converted into sound.
The sound output of a typical Knowles’ speaker is measured in units of dB SPL (sound pressure level) relative to 20 µPa.
Fig. 3: Cross section of a Knowles EH speaker
DIAPHRAGM
DRIVE ROD
OUTPUT TERMINAL
COIL
MAGNETS
ARMATURE
Fig. 4: The motor of the speaker has a coil, an armature, and a pair of permanent magnets.
www.knowles.com
27
Note: All performance curves are typical