Discover great deals on the many top brand items available only on eBay!

Microphones

A microphone, sometimes called a mic (pronounced "mike"), is a transducer that converts sound into an electrical signal. more...

HomeHome
Accessories & CablesAccessories & Cables
AmplifiersAmplifiers
CD Players & RecordersCD Players & Recorders
Cassette DecksCassette Decks
CrossoversCrossovers
DVD Players & Recorders DVD Players & Recorders
Digital Music...Digital Music...
Digital Video Recorders, PVRDigital Video Recorders, PVR
EqualizersEqualizers
Headphones, HeadsetsHeadphones, Headsets
Home Audio MiscHome Audio Misc
Home Theater ProjectorsHome Theater Projectors
Home Theater in a Box Home Theater in a Box
KaraokeKaraoke
Complete SystemsComplete Systems
Karaoke CDs, SongsKaraoke CDs, Songs
MicrophonesMicrophones
MixersMixers
Players / DecodersPlayers / Decoders
MiniDisc PlayersMiniDisc Players
OtherOther
PreamplifiersPreamplifiers
ProcessorsProcessors
RadiosRadios
ReceiversReceivers
Remote ControlsRemote Controls
Satellite Radio Satellite Radio
Satellite, Cable TVSatellite, Cable TV
Shelf, Compact SystemsShelf, Compact Systems
Speakers & SubwoofersSpeakers & Subwoofers
Televisions TVTelevisions TV
Tuners, AM/FMTuners, AM/FM
TurntablesTurntables
VCRsVCRs
Vintage ElectronicsVintage Electronics
Wholesale LotsWholesale Lots

Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture production, live and recorded audio engineering, and in radio and television broadcasting.

The invention of a practical microphone was crucial to the early development of the telephone system. Emile Berliner invented the first microphone on March 4, 1877, but the first useful microphone was invented by Alexander Graham Bell. Many early developments in microphone design took place in Bell Laboratories.

In all microphones, sound waves (sound pressure) are translated into mechanical vibrations in a thin, flexible diaphragm. These sound vibrations are then converted by various methods into an electrical signal which varies in voltage amplitude and frequency in an analog of the original sound. For this reason, a microphone is an acoustic wave to voltage modulation transducer.

Microphone varieties

Capacitor or Condenser microphones

In a capacitor microphone, also known as a condenser microphone, the diaphragm acts as one plate of a capacitor, and the vibrations produce changes in the distance between the plates. Since the plates are biased with a fixed charge (Q), the voltage maintained across the capacitor plates changes with the vibrations in the air., according to the capacitance equation:

Q = C \cdot V

where Q = charge in coulombs, C = capacitance in farads and V = potential difference in volts. The capacitance of the plates is inversely proportional to the distance between them for a parallel-plate capacitor. (See capacitance for details.):

C \propto \frac{A}{d}

Capacitor microphones can be expensive and require a power supply, commonly provided from mic inputs as phantom power, but give a high-quality sound signal and are now the preferred choice in laboratory and studio recording applications.

Electret condenser microphones

A foil electret microphone is a relatively new type of condenser microphone invented at Bell laboratories in 1962 by Gerhard Sessler and Jim West , and often simply called an electret microphone. An electret is a dielectric material that has been permanently electrically charged or polarised. Electret microphones have existed since the 1920s but were considered impractical, but they have now become the most common type of all, used in many applications from high-quality recording and lavalier use to built-in microphones in small sound recording devices. Though electret mics were once considered low-cost and low quality, the best ones can now rival capacitor mics in every respect apart from low noise and even have the long-term stability and ultra-flat response needed for a measuring microphone. Unlike other condenser microphones they require no polarising voltage, but normally contain an integrated preamplifier which does require power (often incorrectly called polarizing power or bias). The integral preamp usually forms part of the mic capsule in modern designs, sensing the electric field from the diaphragm stretched across in front of it directly, and this sets the limit of noise performance, which though it can be as low as 26 dBA SPL (38 dB SPL 468-wtd) cannot currently rival the best capacitor mics. Electrets are frequently phantom powered in sound reinforcement applications.

Read more at Wikipedia.org


[List your site here Free!]

New listing
		Tuxun Q7 Ktv Microphone Wireless Bluetooth Karaoke Singing Mic Speaker PlayerNew listing Tuxun Q7 Ktv Microphone Wireless Bluetooth Karaoke Singing Mic Speaker Player $49.99 New listing
		MicGeek Q10S Wireless Bluetooth Karaoke Microphone Speaker Home Ktv Golden HotNew listing MicGeek Q10S Wireless Bluetooth Karaoke Microphone Speaker Home Ktv Golden Hot $44.45 Trending at $48.89
New listing
		MicGeek Q10S Wireless Microphone Bluetooth Ktv Rose Gold Handheld For SmartphoneNew listing MicGeek Q10S Wireless Microphone Bluetooth Ktv Rose Gold Handheld For Smartphone $46.59 New listing
		Tuxun Q7 Microphone Wireless Handheld Portable Karaoke For Computer SmartphoneNew listing Tuxun Q7 Microphone Wireless Handheld Portable Karaoke For Computer Smartphone $49.99
New listing
		Tuxun Q7 Wireless Bluetooth In Out door Ktv Karaoke Microphone + Speaker -GoldNew listing Tuxun Q7 Wireless Bluetooth In Out door Ktv Karaoke Microphone + Speaker -Gold $49.99 New listing
		Karaoke Latin Stars 342 Jose Jose Vol.4New listing Karaoke Latin Stars 342 Jose Jose Vol.4 $9.99
New listing
		Karaoke Latin Stars 350 Alejandro Fernandez Vol.4New listing Karaoke Latin Stars 350 Alejandro Fernandez Vol.4 $9.99 New listing
		Karaoke Microphone Bluetooth Speaker Rechargeable Mini Handheld Mic Ktv MachineNew listing Karaoke Microphone Bluetooth Speaker Rechargeable Mini Handheld Mic Ktv Machine $29.99 List price: Previous Price $49.99
New listing
		Wireless Bluetooth Microphone Karaoke Sing Stereo Player+Receiver For iPhone PcNew listing Wireless Bluetooth Microphone Karaoke Sing Stereo Player+Receiver For iPhone Pc $48.20 New listing
		Karaoke Latin Stars 347 Aventura Vol.2New listing Karaoke Latin Stars 347 Aventura Vol.2 $9.99
New listing
		Karaoke Latin Stars 341 Daniela Romo Vol.1New listing Karaoke Latin Stars 341 Daniela Romo Vol.1 $9.99 New listing
		Oem LeadSinger Ls-3700W Karaoke Microphone & Wireless Ls-3222 2 MusikartridgesNew listing Oem LeadSinger Ls-3700W Karaoke Microphone & Wireless Ls-3222 2 Musikartridges $132.04
New listing
		Karaoke Latin Stars 344 Selena Vol.3New listing Karaoke Latin Stars 344 Selena Vol.3 $9.99 New listing
		Karaoke Latin Stars 346 Camilo Sesto Vol.4New listing Karaoke Latin Stars 346 Camilo Sesto Vol.4 $9.99
New listing
		[Hot Sale] Tuxun Q7 Wireless Bluetooth Metal HandHeld Microphone Speaker KaraokeNew listing [Hot Sale] Tuxun Q7 Wireless Bluetooth Metal HandHeld Microphone Speaker Karaoke $49.99 New listing
		MicGeek Q10S Wireless Bluetooth Mic Karaoke Player Ktv Rose&Gold For iphone7/6sNew listing MicGeek Q10S Wireless Bluetooth Mic Karaoke Player Ktv Rose&Gold For iphone7/6s $48.01
New listing
		VocoStar Mark-11.5 Karaoke Microphone W/3 Aux Cords Tested Working Genuine UsedNew listing VocoStar Mark-11.5 Karaoke Microphone W/3 Aux Cords Tested Working Genuine Used $21.99 New listing
		Karaoke Latin Stars 333 Buena Vista Social Club Vol.1New listing Karaoke Latin Stars 333 Buena Vista Social Club Vol.1 $9.99
New listing
		Singing Machine Smm-107 Karaoke Wireless Microphone (Black) NewNew listing Singing Machine Smm-107 Karaoke Wireless Microphone (Black) New $13.95 New listing
		Tuxun Q7 Wireless Bluetooth Microphone Speaker Karaoke For iPhone 7 6S 6 EtcNew listing Tuxun Q7 Wireless Bluetooth Microphone Speaker Karaoke For iPhone 7 6S 6 Etc $49.99
New listing
		Isbal(Tm) Mini microphone Portable Karaoke Player Ktv Speakers 3.5mm Hands FreeNew listing Isbal(Tm) Mini microphone Portable Karaoke Player Ktv Speakers 3.5mm Hands Free $14.22 New listing
		Vintage Karaoke Microphone w Cable Professional Design Spacetech Black & GoldenNew listing Vintage Karaoke Microphone w Cable Professional Design Spacetech Black & Golden $10.95 Was: Previous Price $14.95
New listing
		Shure Pga48-Qtr Cardioid Dynamic Vocal Microphone with 15' Xlr-Qtr CableNew listing Shure Pga48-Qtr Cardioid Dynamic Vocal Microphone with 15' Xlr-Qtr Cable $38.99 List price: Previous Price $49.99 New listing
		Karaoke Latin Stars 330 Fania All Stars Vol.1New listing Karaoke Latin Stars 330 Fania All Stars Vol.1 $9.99
New listing
		Hello Kitty 10109 Pink Mp3 Karaoke Wireless MicrophoneNew listing Hello Kitty 10109 Pink Mp3 Karaoke Wireless Microphone $28.70 New listing
		Tosing Q7 Handheld Microphone Wireless Ktv Speaker For iphone6s/7/7+ Samsung A12New listing Tosing Q7 Handheld Microphone Wireless Ktv Speaker For iphone6s/7/7+ Samsung A12 $63.48
New listing
		microphone, wireless microphone karaoke bluetooth, handheld microphone withNew listing microphone, wireless microphone karaoke bluetooth, handheld microphone with $68.51 0000048F New listing
		LeadSinger Music Video Karaoke Microphone Ls-K2 tested workingNew listing LeadSinger Music Video Karaoke Microphone Ls-K2 tested working $22.00
New listing
		Karaoke Latin Stars 338 Shakira Vol.5New listing Karaoke Latin Stars 338 Shakira Vol.5 $9.99 New listing
		Karaoke Latin Stars 349 Camila Vol.1New listing Karaoke Latin Stars 349 Camila Vol.1 $9.99
New listing
		rainbow mic, wireless microphone karaoke(3rd generation), 3-in-1 bluetoothNew listing rainbow mic, wireless microphone karaoke(3rd generation), 3-in-1 bluetooth $41.71 New listing
		Singing Machine Smm205 Unidirectional Dynamic Microphone with 10 Ft CordNew listing Singing Machine Smm205 Unidirectional Dynamic Microphone with 10 Ft Cord $10.95
New listing
		Karaoke Latin Stars 337 Tito Nieves - Exitos Marco Antonio Solis Vol.2New listing Karaoke Latin Stars 337 Tito Nieves - Exitos Marco Antonio Solis Vol.2 $9.99 New listing
		Philips Lfh9172 Condenser Cable Professional MicrophoneNew listing Philips Lfh9172 Condenser Cable Professional Microphone $140.00
New listing
		Karaoke Latin Stars 343 Los Prisioneros Vol.1New listing Karaoke Latin Stars 343 Los Prisioneros Vol.1 $9.99 New listing
		Singing Machine Microphone with Adaptor. WirelessNew listing Singing Machine Microphone with Adaptor. Wireless $0.99
New listing
		VocoStar Mark - 11.5 Microphone Karaoke Microphone W/Cable Used Tested WorkingNew listing VocoStar Mark - 11.5 Microphone Karaoke Microphone W/Cable Used Tested Working $8.99 New listing
		wireless microphone karaoke pro, 3-in-1 2200mah bluetooth aluminium alloyNew listing wireless microphone karaoke pro, 3-in-1 2200mah bluetooth aluminium alloy $56.61
New listing
		Karaoke Microphone Bluetooth Wireless Speaker Rechargeable Mini Handheld Mic KtvNew listing Karaoke Microphone Bluetooth Wireless Speaker Rechargeable Mini Handheld Mic Ktv $39.99 List price: Previous Price $59.99 New listing
		New Ktv-K088 Mini Wireless Karaoke Player Microphone Bluetooth Speaker Mic GoldNew listing New Ktv-K088 Mini Wireless Karaoke Player Microphone Bluetooth Speaker Mic Gold $16.05
New listing
		[Hot Sale] Q7 Wireless Bluetooth Metal HandHeld Microphone Speaker Karaoke -GoldNew listing [Hot Sale] Q7 Wireless Bluetooth Metal HandHeld Microphone Speaker Karaoke -Gold $49.99 New listing
		Selfie Microphone Mic Set karaoke for smart phones iPhone 6/Plus Black GoldNew listing Selfie Microphone Mic Set karaoke for smart phones iPhone 6/Plus Black Gold $16.99
New listing
		Karaoke Latin Stars 334 Hector Lavoe Vol.3New listing Karaoke Latin Stars 334 Hector Lavoe Vol.3 $9.99 New listing
		Karaoke Latin Stars 348 Mocedades Vol.1New listing Karaoke Latin Stars 348 Mocedades Vol.1 $9.99
New listing
		Euc 2000 Hasbro Takara Xavix E-Kara Microphone & 5 Song Cartridge Us-M001New listing Euc 2000 Hasbro Takara Xavix E-Kara Microphone & 5 Song Cartridge Us-M001 $6.99 New listing
		Genuine V9 Bluetooth Wireless Microphone Echo Sound Reverberation Portable HiFiNew listing Genuine V9 Bluetooth Wireless Microphone Echo Sound Reverberation Portable HiFi $29.99
Click to see more Microphones items at www.ebay.com
Prices current as of last update, 09/15/17 4:29pm.

Home Contact Resources Exchange Links ebay