Microphones - Revision history

Carlb: /* Microphone connections */

2009-04-09T01:21:40Z

Microphone connections

← Older revision		Revision as of 18:21, 8 April 2009
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	A multitude of plugs and connections have developed over the years. One of the best resources for information on microphone plug connections can be found [http://homepage.ntlworld.com/rg4wpw/date.html here] from Roy G4WPW.		A multitude of plugs and connections have developed over the years. One of the best resources for information on microphone plug connections can be found [http://homepage.ntlworld.com/rg4wpw/date.html here] from Roy G4WPW.


			{{electronics}}

TimVK4YEH: corrected callsign

2008-03-06T18:13:46Z

corrected callsign

← Older revision		Revision as of 11:13, 6 March 2008
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	== Microphone connections ==		== Microphone connections ==

	A multitude of plugs and connections have developed over the years. One of the best resources for information on microphone plug connections can be found [http://homepage.ntlworld.com/rg4wpw/date.html here] from ~~RG4WPW~~.		A multitude of plugs and connections have developed over the years. One of the best resources for information on microphone plug connections can be found [http://homepage.ntlworld.com/rg4wpw/date.html here] from Roy G4WPW.

TimVK4YEH: added external link to mic connections gr4wpw

2008-03-06T10:23:18Z

added external link to mic connections gr4wpw

← Older revision		Revision as of 03:23, 6 March 2008
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	'''Piezoelectric or Crystal microphones''' rely on fact that some crystalline materials produce an electric current when subjected to pressure. An example of this is potassium sodium tartrate. Sound waves cause pressure changes in the crystal in turn causing variable voltages to be produced.		'''Piezoelectric or Crystal microphones''' rely on fact that some crystalline materials produce an electric current when subjected to pressure. An example of this is potassium sodium tartrate. Sound waves cause pressure changes in the crystal in turn causing variable voltages to be produced.

			== Microphone connections ==

			A multitude of plugs and connections have developed over the years. One of the best resources for information on microphone plug connections can be found [http://homepage.ntlworld.com/rg4wpw/date.html here] from RG4WPW.

TimVK4YEH: added info to dynamic mics - more to follow

2008-03-06T10:15:34Z

added info to dynamic mics - more to follow

← Older revision		Revision as of 03:15, 6 March 2008
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	Also known as "dynamic coil" microphones, these operate by means of a coil attached to the diaphragm that moves within a magnetic field. This motion produces current changes in the coil.		Also known as "dynamic coil" microphones, these operate by means of a coil attached to the diaphragm that moves within a magnetic field. This motion produces current changes in the coil.

			A '''moving coil microphone ''' is essentially a loudspeaker reversed. The diaphragm has connected to it a circular coil that sits within the field of a permanent magnet. Sound waves hitting the diaphragm cause the coil to vibrate in the magnetic field, hence generating a current by electromagnetic induction.

			'''Ribbon microphones''' are composed of a thin metal ribbon suspended in a magnetic field. Vibrations in the ribbon cause an electric current.

			'''Carbon microphones''' use a thin layer of granulated carbon between two metal plates, one of which is the diaphragm. When a voltage is applied across the plates, a small current flows through the carbon. Sound waves hitting the diaphragm change the pressure on the carbon, thereby changing its resistance, leading to variations in current flow.

			'''Piezoelectric or Crystal microphones''' rely on fact that some crystalline materials produce an electric current when subjected to pressure. An example of this is potassium sodium tartrate. Sound waves cause pressure changes in the crystal in turn causing variable voltages to be produced.

TimVK4YEH: spelling errors - added hsitory heading , no detail

2008-03-04T08:41:29Z

spelling errors - added hsitory heading , no detail

← Older revision		Revision as of 01:41, 4 March 2008
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	== Basic ~~operation~~ ==		== Basic Operation ==

	A microphone converts sound into an electrical signal. Externally in its simplest form a microphone consists of a PTT (Press To Talk) button, a mouthpiece and a cable to connect it to the transceiver. More sophisticated microphones have extra "buttons" to achieve functions such as ~~proramming~~, changing frequencies and channels and controlling tone ~~genneration~~ for modes such as [[IRLP]] and [[Echolink]].		A microphone converts sound into an electrical signal. Externally in its simplest form a microphone consists of a PTT (Press To Talk) button, a mouthpiece and a cable to connect it to the transceiver. More sophisticated microphones have extra "buttons" to achieve functions such as programming, changing frequencies and channels and controlling tone generation for modes such as [[IRLP]] and [[Echolink]].

	Internally all microphones have a transducer which converts sound energy into electrical energy. Most commonly, a thin membrane is used to capture sound energy by vibrating in response to sound waves striking it. The movement of the membrane is then used to generate an electric current.		Internally all microphones have a transducer which converts sound energy into electrical energy. Most commonly, a thin membrane is used to capture sound energy by vibrating in response to sound waves striking it. The movement of the membrane is then used to generate an electric current.

			== History ==

	== Types of microphone ==		== Types of microphone ==
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	Also known as Capacitor Microphones, these rely on the vibrations of the receiver membrane changing the capacitance between two plates, by altering the distance between them.		Also known as Capacitor Microphones, these rely on the vibrations of the receiver membrane changing the capacitance between two plates, by altering the distance between them.

	In '''DC Biased'''condenser microphone a nearly constant charge is maintained between the plates, with the voltage across the plates changing with distance between them. This voltage change is amplified for modulation of RF signals in the transceiver.		In '''DC Biased'''condenser microphone a nearly constant charge is maintained between the plates, with the voltage across the plates changing with distance between them. This voltage change is amplified for modulation of RF signals in the transceiver.

	In '''RF ''' condenser microphones, the bias voltage across the plates is controlled by by a low power fixed frequency oscillator. Capacitance changes when the diaphragm moves then modulate the amplitude of the oscillator.		In '''RF ''' condenser microphones, the bias voltage across the plates is controlled by by a low power fixed frequency oscillator. Capacitance changes when the diaphragm moves then modulate the amplitude of the oscillator.

	'''Electret''' microphones are similar in some ways to the condenser microphones described above. The difference is in the way the constant charge is created across the capacitance plates. In the electret, the charge is maintained by a permanently charged ferromagnetic ~~matrial~~		'''Electret''' microphones are similar in some ways to the condenser microphones described above. The difference is in the way the constant charge is created across the capacitance plates. In the electret, the charge is maintained by a permanently charged ferromagnetic material

	=== Dynamic Microphones ===		=== Dynamic Microphones ===

	Also known as "dynamic coil" microphones, these operate by means of a coil attached to the diaphragm that moves within a magnetic field. This motion produces current changes in the coil.		Also known as "dynamic coil" microphones, these operate by means of a coil attached to the diaphragm that moves within a magnetic field. This motion produces current changes in the coil.

TimVK4YEH: added some detail - more to come

2008-03-04T08:38:10Z

added some detail - more to come

← Older revision		Revision as of 01:38, 4 March 2008
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	== Types of microphone ==		== Types of microphone ==

			=== Condenser Microphones ===

			Also known as Capacitor Microphones, these rely on the vibrations of the receiver membrane changing the capacitance between two plates, by altering the distance between them.

			In '''DC Biased'''condenser microphone a nearly constant charge is maintained between the plates, with the voltage across the plates changing with distance between them. This voltage change is amplified for modulation of RF signals in the transceiver.

			In '''RF ''' condenser microphones, the bias voltage across the plates is controlled by by a low power fixed frequency oscillator. Capacitance changes when the diaphragm moves then modulate the amplitude of the oscillator.

			'''Electret''' microphones are similar in some ways to the condenser microphones described above. The difference is in the way the constant charge is created across the capacitance plates. In the electret, the charge is maintained by a permanently charged ferromagnetic matrial

			=== Dynamic Microphones ===

			Also known as "dynamic coil" microphones, these operate by means of a coil attached to the diaphragm that moves within a magnetic field. This motion produces current changes in the coil.

TimVK4YEH: /* Basic operation */

2008-03-04T07:37:55Z

Basic operation

← Older revision		Revision as of 00:37, 4 March 2008
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	== Basic operation ==		== Basic operation ==

	A microphone converts sound into an electrical signal. Externally in its simplest form a microphone consists of a PTT (Press To Talk)button, a mouthpiece and a cable to connect it to the transceiver. More sophisticated microphones have extra "buttons" to achieve functions such as proramming, changing frequencies and channels and controlling tone genneration for modes such as [[IRLP]] and [[Echolink]].		A microphone converts sound into an electrical signal. Externally in its simplest form a microphone consists of a PTT (Press To Talk) button, a mouthpiece and a cable to connect it to the transceiver. More sophisticated microphones have extra "buttons" to achieve functions such as proramming, changing frequencies and channels and controlling tone genneration for modes such as [[IRLP]] and [[Echolink]].

	Internally all microphones have a transducer which converts sound energy into electrical energy. Most commonly, a thin membrane is used to capture sound energy by vibrating in response to sound waves striking it. The movement of the membrane is then used to generate an electric current.		Internally all microphones have a transducer which converts sound energy into electrical energy. Most commonly, a thin membrane is used to capture sound energy by vibrating in response to sound waves striking it. The movement of the membrane is then used to generate an electric current.

	== Types of microphone ==		== Types of microphone ==

TimVK4YEH: started work on this page - lots to do!

2008-03-04T03:07:05Z

started work on this page - lots to do!

New page

== Basic operation ==

A microphone converts sound into an electrical signal. Externally in its simplest form a microphone consists of a PTT (Press To Talk)button, a mouthpiece and a cable to connect it to the transceiver. More sophisticated microphones have extra "buttons" to achieve functions such as proramming, changing frequencies and channels and controlling tone genneration for modes such as [[IRLP]] and [[Echolink]].

Internally all microphones have a transducer which converts sound energy into electrical energy. Most commonly, a thin membrane is used to capture sound energy by vibrating in response to sound waves striking it. The movement of the membrane is then used to generate an electric current.

== Types of microphone ==