CM-23299-000 Knowles Acoustics, CM-23299-000 Datasheet - Page 26
CM-23299-000
Manufacturer Part Number
CM-23299-000
Description
SPEAKER Z=150 OHMS 28AWG WIRES
Manufacturer
Knowles Acoustics
Series
CMr
Type
Magnetic, Balanced Armature, Face Portr
Specifications of CM-23299-000
Frequency Range
100Hz ~ 5kHz
Impedance
150 Ohm
Size / Dimension
16.54mm Dia x 8.26mm H
Sound Pressure Level
106dB
Termination
Wire Leads
Shape
Round
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Rated
-
Power - Max
-
Material - Cone
-
Material - Magnet
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
423-1105
26
MICROPHONES
Microphones measure sound pressure. Inside a Knowles microphone is a thin flexible diaphragm, an electrically
charged plate, and an amplifier (Fig. 1). The output voltage is proportional to changes in the small separation
between the diaphragm and the charged plate (Fig. 2).
As sound pressure inside the front cavity increases, the diaphragm is pushed closer to the plate. As the
pressure decreases, it moves further away. The motion of the diaphragm produces a small electrical signal that
is amplified by a miniature circuit inside the microphone.
The sensitivity of a typical Knowles’ microphone is measured in units of dB relative to 1 Volt per 0.1 Pascal.
Fig 1: Cross section of a Knowles EM microphone
FIG. 2: EM diaphragm and electret
MICROPHONE AND SPEAKER BASICS
MICROPHONE AND SPEAKER BASICS
AMPLIFIER
OUTPUT TERMINAL
CHARGE PLATE
CHARGE PLATE
DIAPHRAGM
DIAPHRAGM
www.knowles.com
FRONT CAVITY
AIR GAP SEPARATION
WIRE
SOUND PRESSURE