Patents-Review.com
ClassID:

232033 ⎘

H04R19/016 - CPC Classification

Classification description:

Electrostatic transducers characterised by the use of electrets for microphones

Recent Application in this class:
#1
20250280245
2025-09-04

ELECTRET CAPSULE CIRCUIT

 #2
20250267404
2025-08-21

MICROPHONE ARRANGEMENT

 #3
20250063310
2025-02-20

PARYLENE ELECTRET CONDENSER MICROPHONE BACKPLATE

 #4
20240334118
2024-10-03

AUDIO SYSTEMS, DEVICES, AND METHODS

 #5
20230421966
2023-12-28

ELECTRET MICROPHONE

 #6
20230403502
2023-12-14

DIRECTIONAL MICROPHONE RECEIVER AND SOUND DEVICE

 #7
20230396932
2023-12-07

ELECTRET MICROPHONE

 #8
20230292056
2023-09-14

ELECTRET CAPSULE

 #9
20230283964
2023-09-07

Parylene electret condenser microphone backplate

 #10
20230179911
2023-06-08

Audio systems, devices, and methods

 #11
20230095033
2023-03-30

SUBSTITUTED THIOLATE SALT MELT ADDITIVES

 #12
20230052886
2023-02-16

Feedforward control of an enclosed space with multiple incoherent excitations

 #13
20230047408
2023-02-16

Acoustic microphone arrays

 #14
20220278267
2022-09-01

Sound pressure-electrical signal conversion device and conversion method for same

 #15
20220272460
2022-08-25

Parylene electret condenser microphone backplate

 #16
20220225016
2022-07-14

Audio systems, devices, and methods

 #17
20220182758
2022-06-09

Electrical device for reducing noise

 #18
20220009768
2022-01-13

Sound producing package structure including sound producing membranes actuated toward cavity center

 #19
20220007104
2022-01-06

Offset cartridge microphones

 #20
20210409872
2021-12-30

Electroacoustic Transducer

 #21
20210405254
2021-12-30

RAIN SENSOR

 #22
20210385564
2021-12-09

Voice input apparatus

 #23
20210306760
2021-09-30

Condenser microphone pattern adjustment

 #24
20210281955
2021-09-09

Thin and flexible self-powered vibration transducer employing triboelectric nanogeneration

 #25
20210136477
2021-05-06

WIRELESS EARPHONE

 #26
20200396548
2020-12-17

Microphone and methods of assembling microphones

 #27
20200377361
2020-12-03

MEMS vibration element, method of manufacturing MEMS vibration element, and vibration-driven energy harvester

 #28
20200374610
2020-11-26

Method and apparatus for capturing and rendering an audio scene

 #29
20200236468
2020-07-23

Electret condenser microphone with low noise figure and method for producing the same

 #30
20200213690
2020-07-02

MEMS microphone

 #31
20200178001
2020-06-04

Push-pull electret transducer with controlled restoring force for low frequency microphones and energy harvesting

 #32
20200174033
2020-06-04

Vibration sensor for a portable device including a damping arrangement to reduce mechanical resonance peak of sensor

 #33
20200142099
2020-05-07

Rain sensor

 #34
20200092657
2020-03-19

High performance sealed-gap capacitive microphone

 #35
20200084526
2020-03-12

Method and apparatus for capturing and rendering an audio scene

 #36
20200039817
2020-02-06

MEMS device and electronics apparatus

 #37
20200007992
2020-01-02

High performance sealed-gap capacitive microphone with various gap geometries

 #38
20190373375
2019-12-05

Thin and flexible self-powered vibration transducer employing triboelectric nanogeneration

 #39
20190356988
2019-11-21

Microphone and methods of assembling microphones

 #40
20190335262
2019-10-31

Acoustic assembly having an acoustically permeable membrane

 #41
20190297430
2019-09-26

Condenser microphone

 #42
20190253791
2019-08-15

Top port multi-part surface mount silicon condenser microphone

 #43
20190251945
2019-08-15

Microphone unit and noise reduction device using same, and integrated circuit component

 #44
20190245133
2019-08-08

PIEZOELECTRIC DEVICE

 #45
20190215591
2019-07-11

Electret condenser microphone and manufacturing method thereof

 #46
20190169022
2019-06-06

Microelectromechanical system (MEMS) device packaging

 #47
20190141455
2019-05-09

Sensor output device, sound output device, and musical instrument

 #48
20190081598
2019-03-14

Split signal differential MEMS microphone

 #49
20190077671
2019-03-14

Process for the formation of a graphene membrane component, graphene membrane component, microphone and hall-effect sensor

 #50
20190045297
2019-02-07

Microphone for a hearing aid

 #51
20190014419
2019-01-10

Electret element, microphone having electret element mounted therein and electret element manufacturing method

 #52
20180368975
2018-12-27

Implantable microphone management

 #53
20180364274
2018-12-20

Vibration sensor for a portable device including a damping arrangement to reduce mechanical resonance peak of sensor

 #54
20180352337
2018-12-06

MEMS sound transducer, MEMS microphone and method for providing a MEMS sound transducer

 #55
20180348877
2018-12-06

Gesture recognition apparatus and components thereof

 #56
20180310096
2018-10-25

Offset cartridge microphones

 #57
20180302726
2018-10-18

High performance sealed-gap capacitive microphone

 #58
20180295454
2018-10-11

Acoustic transducer and microphone using the acoustic transducer

 #59
20180279057
2018-09-27

MEMS transducer package

 #60
20180249242
2018-08-30

Top port multi-part surface mount MEMS microphone

 #61
20180213311
2018-07-26

Top port microphone and method for the production of same

 #62
20180201511
2018-07-19

Process for the formation of a graphene membrane component, graphene membrane component, microphone and hall-effect sensor

 #63
20180176693
2018-06-21

Acoustic transducer

 #64
20180167706
2018-06-14

Telecommunications audio endpoints

 #65
20180146295
2018-05-24

Transducer with a high sensitivity

 #66
20180146272
2018-05-24

System for continuous monitoring of body sounds

 #67
20180077501
2018-03-15

Receiver with integrated membrane movement detection

 #68
20180048966
2018-02-15

Microphone and methods of assembling microphones

 #69
20180048965
2018-02-15

Charge pump assembly

 #70
20180029880
2018-02-01

Microelectromechanical system (MEMS) device packaging

 #71
20180012588
2018-01-11

Split signal differential MEMS microphone

 #72
20170318394
2017-11-02

Electret element, microphone having electret element mounted therein and electret element manufacturing method

 #73
20170311066
2017-10-26

Sound pickup device and sound processing device

 #74
20170311065
2017-10-26

Sound pickup device and sound processing device

 #75
20170289680
2017-10-05

Impedance matching method and apparatus for electret microphone, and communication device

 #76
20170280218
2017-09-28

MEMS device with a valve mechanism

 #77
20170272879
2017-09-21

Glitch detection and method for detecting a glitch

 #78
20170264997
2017-09-14

Top port multi-part surface mount silicon condenser microphone

 #79
20170230748
2017-08-10

Offset cartridge microphones

 #80
20170208390
2017-07-20

Microphone for a hearing aid

 #81
20170180870
2017-06-22

System for continuous monitoring of body sounds

 #82
20170078787
2017-03-16

Unidirectional condenser microphone unit, unidirectional condenser microphone, and method of manufacturing unidirectional condenser microphone unit

 #83
20170055081
2017-02-23

Silicon microphone with high-aspect-ratio corrugated diaphragm and a package with the same

 #84
20170026728
2017-01-26

Article of Manufacture Having Microphone Devices Mounted on a Non-Planar Printed Circuit Board

 #85
20160360304
2016-12-08

Method and means for regulating the electrical bias voltage at the measuring capacitor of a MEMS sensor element

 #86
20160345097
2016-11-24

Diaphragm, electroacoustic transducer, and electroacoustic transducer apparatus

 #87
20160337751
2016-11-17

Systems and methods for using electrostatic microphone

 #88
20160309264
2016-10-20

Acoustic Apparatus Using Flex PCB Circuit With Integrated I/O Fingers

 #89
20160295333
2016-10-06

Entrained microphones

 #90
20160284974
2016-09-29

Piezoelectric device

 #91
20160241951
2016-08-18

Top port multi-part surface mount silicon condenser microphone

 #92
20160227330
2016-08-04

Acoustic sensor

 #93
20160221822
2016-08-04

System and method for an integrated transducer and temperature sensor

 #94
20160182988
2016-06-23

Microphone with soft clipping circuit

 #95
20160182984
2016-06-23

Microphone

 #96
20160165356
2016-06-09

Condenser type electroacoustic transducer

 #97
20160165355
2016-06-09

Microelectromechanical systems electret microphone

 #98
20160157028
2016-06-02

Stereophonic focused hearing

 #99
20160157023
2016-06-02

Acoustic transducer

 #100
20160122177
2016-05-05

Trapped membrane

 #101
20160094918
2016-03-31

Acoustic transducer and microphone

 #102
20160037257
2016-02-04

Microphone with programmable frequency response

 #103
20160033793
2016-02-04

Transparent lens microphone

 #104
20160029110
2016-01-28

Silicon condenser microphone

 #105
20150341721
2015-11-26

Variable directivity electret condenser microphone

 #106
20150341720
2015-11-26

Variable directivity electret condenser microphone

 #107
20150334499
2015-11-19

Glitch detection and method for detecting a glitch

 #108
20150326962
2015-11-12

Condenser microphone

 #109
20150312682
2015-10-29

Condenser microphone

 #110
20150271585
2015-09-24

Microphone package and method for providing a microphone package

 #111
20150264462
2015-09-17

Capacitive transducer

 #112
20150181349
2015-06-25

Microphone Circuit And Motor Assembly

 #113
20150146914
2015-05-28

Audio transducer with electrostatic discharge protection

 #114
20150125008
2015-05-07

Frequency dependent switch

 #115
20150110306
2015-04-23

Condenser microphone

 #116
20150104056
2015-04-16

Electret condenser microphone

 #117
20150098592
2015-04-09

Electrodynamic acoustic transducer, condenser microphone and condenser headphones

 #118
20150063608
2015-03-05

Capacitive MEMS element including a pressure-sensitive diaphragm

 #119
20150016635
2015-01-15

Differential microphone and method for driving a differential microphone

 #120
20140334646
2014-11-13

Apparatus for securing components in an electret condenser microphone (ECM)

 #121
20140270204
2014-09-18

Reset circuit for MEMS capacitive microphones

 #122
20140191343
2014-07-10

Acoustic transducer and microphone using the acoustic transducer

 #123
20140133679
2014-05-15

Process for the production of a capacitor microphone and a capacitor microphone

 #124
20140105444
2014-04-17

Loudspeaker

 #125
20140098980
2014-04-10

Method and apparatus for capturing and rendering an audio scene

 #126
20140093102
2014-04-03

Switchable attenuation circuit for MEMS microphone systems

 #127
20140086433
2014-03-27

Microphone with programmable frequency response

 #128
20140053713
2014-02-27

Cymbal transducer using electret accelerometer

 #129
20140010386
2014-01-09

Amplifier circuit for a two-wire interface

 #130
20140010384
2014-01-09

Microphone amplifier circuit

 #131
20140010374
2014-01-09

Acoustic transducer and interface circuit

 #132
20130294622
2013-11-07

Acoustic transducer

 #133
20130230183
2013-09-05

Echo cancellation

 #134
20130208915
2013-08-15

System and method for a PCM interface for a capacitive signal source

 #135
20130129116
2013-05-23

Glitch detection and method for detecting a glitch

 #136
20130094678
2013-04-18

Acoustic transducer assembly

 #137
20130094676
2013-04-18

Electret Condenser Microphone

 #138
20130089222
2013-04-11

Condenser microphone

 #139
20130044899
2013-02-21

Dual Backplate Microphone

 #140
20130010995
2013-01-10

WELDING TYPE CONDENSER MICROPHONE USING SPRING BASE

 #141
20130010988
2013-01-10

Implantable Electret Microphone

 #142
20130010981
2013-01-10

Microphone

 #143
20120321111
2012-12-20

Electret condenser microphone

 #144
20120300969
2012-11-29

Microphone unit and voice input device comprising same

 #145
20120275621
2012-11-01

Surface-mounted microphone arrays on flexible printed circuit boards

 #146
20120269363
2012-10-25

Temperature compensated microphone

 #147
20120250925
2012-10-04

Packages and methods for packaging microphone devices

 #148
20120250881
2012-10-04

MICROPHONE BIASING

 #149
20120230500
2012-09-13

ECM digital microphone temperature compensation

 #150
20120210560
2012-08-23

Method for manufacturing a condenser microphone

 #151
20120162948
2012-06-28

Sensor module

 #152
20120140956
2012-06-07

DIFFERENTIAL MICROPHONE CIRCUIT

 #153
20120114146
2012-05-10

Condenser microphone

 #154
20120106769
2012-05-03

Filter circuit for an electret microphone

 #155
20120093340
2012-04-19

VARIABLE DIRECTIONAL MICROPHONE UNIT AND VARIABLE DIRECTIONAL MICROPHONE

 #156
20120091545
2012-04-19

Semiconductor component having a micromechanical microphone structure

 #157
20120076339
2012-03-29

Microphone component and method for operating same

 #158
20120076322
2012-03-29

MICROPHONE

 #159
20120057721
2012-03-08

Component having a micromechanical microphone structure, and method for operating such a microphone component

 #160
20120043629
2012-02-23

Surface mount silicon condenser microphone package

 #161
20120014542
2012-01-19

Narrow directional condenser microphone

 #162
20120008805
2012-01-12

Acoustic Transducer Unit

 #163
20110280418
2011-11-17

Electret condenser microphone

 #164
20110274298
2011-11-10

MEMS MICROPHONE

 #165
20110243350
2011-10-06

Low noise electret microphone

 #166
20110228957
2011-09-22

Omnidirectional button-style microphone

 #167
20110228954
2011-09-22

Electret microphone circuit

 #168
20110210409
2011-09-01

Surface mount silicon condenser microphone package

 #169
20110166299
2011-07-07

Electret and electrostatic induction conversion device

 #170
20110163615
2011-07-07

Patterned electret structures and methods for manufacturing patterned electret structures

 #171
20110142261
2011-06-16

MEMS microphone with programmable sensitivity

 #172
20110123058
2011-05-26

Composite microphone with flexible substrate and conductors

 #173
20110116661
2011-05-19

SHIELD CASE AND MEMS MICROPHONE HAVING IT

 #174
20110110536
2011-05-12

Microphone assembly with integrated self-test circuitry

 #175
20110108838
2011-05-12

Electro-mechanical transducer, an electro-mechanical converter, and manufacturing methods of the same

 #176
20110105686
2011-05-05

Electret and electrostatic induction conversion device

 #177
20110103633
2011-05-05

Capacitor microphone unit and capacitor microphone

 #178
20110085688
2011-04-14

Hearing aid microphone protective barrier

 #179
20110044480
2011-02-24

Electret condenser

 #180
20110042763
2011-02-24

MEMS device, MEMS device module and acoustic transducer

 #181
20110038502
2011-02-17

Electret capacitor microphone with one-piece vocal cavity component

 #182
20110031845
2011-02-10

Electret and electrostatic induction conversion device

 #183
20110013788
2011-01-20

Electret Condenser Microphone

 #184
20110012438
2011-01-20

Electret and electrostatic induction conversion device

 #185
20110002483
2011-01-06

Condenser microphone

 #186
20100328836
2010-12-30

Static eliminator, and microphone electretizing method and apparatus using static eliminator

 #187
20100310096
2010-12-09

Switchable attenuation circuit for MEMS microphone systems

 #188
20100272287
2010-10-28

Patterned implantable electret microphone

 #189
20100270631
2010-10-28

MEMS MICROPHONE

 #190
20100266146
2010-10-21

Integrated circuit device, voice input device and information processing system

 #191
20100266145
2010-10-21

Apparatus, methods and computer programs for converting sound waves to electrical signals

 #192
20100264499
2010-10-21

MEMS device including a chip carrier

 #193
20100254561
2010-10-07

MICROPHONE DEVICE

 #194
20100254549
2010-10-07

Amplifier circuit of capacitor microphone

 #195
20100208919
2010-08-19

ELECTRET CONDENSER MICROPHONE FOR NOISE ISOLATION AND ELECTROSTATIC DISCHARGE PROTECTION

 #196
20100189289
2010-07-29

CAPACITOR MICROPHONE CHIP, CAPACITOR MICROPHONE, AND MANUFACTURING METHOD THEREOF

 #197
20100172521
2010-07-08

Electret assembly for a microphone having a backplate with improved charge stability

 #198
20100167799
2010-07-01

Shield case and MEMS microphone having it

 #199
20100166227
2010-07-01

CIRCUITS FOR BIASING/CHARGING HIGH IMPEDANCE LOADS

 #200
20100127595
2010-05-27

Electret and electrostatic induction conversion device comprising the same

 #201
20100127376
2010-05-27

System and method to provide RF shielding for a MEMS microphone package

 #202
20100119087
2010-05-13

MEMS MICROPHONE DEVICE

 #203
20100119086
2010-05-13

Vibration pickup microphone

 #204
20100065932
2010-03-18

MEMS device, MEMS device module and acoustic transducer

 #205
20100061572
2010-03-11

Capacitive sound transducer having a perforated attenuation disk

 #206
20100046780
2010-02-25

Directional silicon condenser microphone having additional back chamber

 #207
20100027817
2010-02-04

Controlled leakage omnidirectional electret condenser microphone element

 #208
20100002895
2010-01-07

CONDENSER MICROPHONE AND MEMS DEVICE

 #209
20090316935
2009-12-24

Digital microphone

 #210
20090313817
2009-12-24

Sensor module

 #211
20090285415
2009-11-19

Interfacing circuit for a removable microphone

 #212
20090285414
2009-11-19

Audio processing method and system

 #213
20090285412
2009-11-19

Integrated circuit biasing a microphone

 #214
20090274334
2009-11-05

Mounting Method and Holder for SMD Microphone

 #215
20090268930
2009-10-29

Electret condenser microphone

 #216
20090267168
2009-10-29

Electret capacitor type composite sensor

 #217
20090226012
2009-09-10

Electret condenser microphone

 #218
20090214062
2009-08-27

Transducer assembly

 #219
20090214061
2009-08-27

Miniature microphone assembly with solder sealing ring

 #220
20090169033
2009-07-02

Microphone module with electromagnetic interference shielding means

 #221
20090163978
2009-06-25

IMPLANTABLE ELECTRET MICROPHONE

 #222
20090161900
2009-06-25

Microphone assembly for minimizing acoustic feedback from a loudspeaker

 #223
20090161894
2009-06-25

Card type MEMS microphone

 #224
20090154729
2009-06-18

Filter circuit for an electret microphone

 #225
20090141913
2009-06-04

MICROELECTROMECHANICAL SYSTEM

 #226
20090141909
2009-06-04

Microphone Circuit

 #227
20090129622
2009-05-21

MEMS microphone module and manufacturing process thereof

 #228
20090129612
2009-05-21

ELECTRETIZATION METHOD OF CONDENSER MICROPHONE, ELECTRETIZATION APPARATUS, AND MANUFACTURING METHOD OF CONDENSER MICROPHONE USING IT

 #229
20090116662
2009-05-07

AUDIO PROCESSING METHOD AND SYSTEM

 #230
20090110213
2009-04-30

Programmable integrated microphone interface circuit

 #231
20090097687
2009-04-16

Diaphragm for a Condenser Microphone

 #232
20090092274
2009-04-09

Silicon condenser microphone having additional back chamber and sound hole in PCB

 #233
20090087009
2009-04-02

Microphone assembly with a replaceable part

 #234
20090080682
2009-03-26

Electret condenser microphone

 #235
20090074222
2009-03-19

Directional silicon condenser microphone having additional back chamber

 #236
20090060230
2009-03-05

ELECTROMECHANICAL TRANSDUCER AND A PRODUCTION METHOD

 #237
20090051242
2009-02-26

Electrostatic induction conversion device

 #238
20090034773
2009-02-05

MEMS MICROPHONE PACKAGE

 #239
20090034760
2009-02-05

ELECTRONIC COMPONENT, FABRICATION METHOD FOR THE SAME AND ELECTRONIC DEVICE HAVING THE SAME

 #240
20090022350
2009-01-22

Acoustic vibration sensor

 #241
20090003631
2009-01-01

Condenser Microphone

 #242
20080310663
2008-12-18

Microphone package adapted to semiconductor device and manufacturing method therefor

 #243
20080310657
2008-12-18

ELECTRET CONDENSER MICROPHONE

 #244
20080310655
2008-12-18

Programmable integrated microphone interface circuit

 #245
20080265686
2008-10-30

Electret device and electrostatic operating apparatus

 #246
20080247587
2008-10-09

Condenser microphone, S/N ratio improvement therefor, and electronic device therefor

 #247
20080232631
2008-09-25

MICROPHONE AND MANUFACTURING METHOD THEREOF

 #248
20080219483
2008-09-11

Small-footprint microphone module with signal processing functionality

 #249
20080181437
2008-07-31

Electroacoustic transducer

 #250
20080167516
2008-07-10

Implantable microphone having sensitivity and frequency response

 #251
20080155801
2008-07-03

Electret condenser microphone and manufacturing method thereof

 #252
20080144874
2008-06-19

Microphone array with electromagnetic interference shielding means

 #253
20080137885
2008-06-12

Electret Condenser Microphone

 #254
20080130920
2008-06-05

CAPACITOR MICROPHONE MANUFACTURING METHOD AND CAPACITOR MICROPHONE

 #255
20080123876
2008-05-29

ELECTROSTATIC PRESSURE TRANSDUCER AND MANUFACTURING METHOD THEREFOR

 #256
20080112585
2008-05-15

Microphone and microphone mounting structure

 #257
20080107288
2008-05-08

Microphone

 #258
20080101625
2008-05-01

Piezoelectric microphones

 #259
20080083111
2008-04-10

Apparatus and method of producing a microphone assembly

 #260
20080080729
2008-04-03

Electret condensor microphone

 #261
20080063222
2008-03-13

Contact type electret condenser pickup

 #262
20080056523
2008-03-06

Electret condenser microphone

 #263
20080037815
2008-02-14

CONDENSER MICROPHONE

 #264
20080025532
2008-01-31

MICROPHONE CASE AND CONDENSER MICROPHONE

 #265
20080019540
2008-01-24

Electret Microphone Circuit

 #266
20080008347
2008-01-10

Acoustic Transducer

 #267
20070297636
2007-12-27

High performance microphone and manufacturing method thereof

 #268
20070278601
2007-12-06

Method of fabricating MEMS device

 #269
20070274544
2007-11-29

Electretization method and apparatus

 #270
20070258610
2007-11-08

Microphone for a hearing aid

 #271
20070237349
2007-10-11

Earbud earphone and cushion therefor

 #272
20070237345
2007-10-11

METHOD FOR REDUCING PHASE VARIATION OF SIGNALS GENERATED BY ELECTRET CONDENSER MICROPHONES

 #273
20070230722
2007-10-04

Condenser microphone

 #274
20070223730
2007-09-27

Normalization and calibration of microphones in sound-intensity probes

 #275
20070222006
2007-09-27

Micromechanical component and corresponding manufacturing method

 #276
20070217635
2007-09-20

Electret condenser

 #277
20070202627
2007-08-30

Silicon condenser microphone and manufacturing method

 #278
20070201715
2007-08-30

Silicon condenser microphone and manufacturing method

 #279
20070189558
2007-08-16

Electret condenser microphone

 #280
20070189556
2007-08-16

Condenser microphone and method of producing the same

 #281
20070189555
2007-08-16

Electret condenser

 #282
20070167671
2007-07-19

Dual feedback control system for implantable hearing instrument

 #283
20070160247
2007-07-12

Heat-resistant electret condenser microphone

 #284
20070121982
2007-05-31

Electret assembly for a microphone having a backplate with improved charge stability

 #285
20070121967
2007-05-31

Hearing aid with large diaphragm microphone element including a printed circuit board

 #286
20070104339
2007-05-10

Electret condenser microphone

 #287
20070086601
2007-04-19

Flexible wireless air interface system

 #288
20070082421
2007-04-12

Method of fabricating a miniature silicon condenser microphone

 #289
20070076904
2007-04-05

Microphone preamplifier

 #290
20070029894
2007-02-08

Electret covered with an insulated film and an electret condenser having the electret

 #291
20070025571
2007-02-01

Electret Condenser Microphone

 #292
20070025569
2007-02-01

Condenser microphone unit and condenser microphone

 #293
20070023690
2007-02-01

Method of producing heat-resistant electrically charged fluororesin material and method of producing electret condenser microphone using heat-resistant electrically charged fluororesin material

 #294
20070017077
2007-01-25

Method for manufacturing condenser microphone

 #295
20070010141
2007-01-11

Mounting substrate and microphone mounted thereon

 #296
20070009111
2007-01-11

Microphone assembly with P-type preamplifier input stage

 #297
20070003087
2007-01-04

Hearing aid microphone protective barrier

 #298
20070003081
2007-01-04

Moisture resistant microphone

 #299
20060285707
2006-12-21

Electro-acoustic transducer

 #300
20060280320
2006-12-14

Surface mountable electret condenser microphone