Light Emitting Diode - Revision history

DT Online: Added Application Schematic

2016-11-02T17:16:26Z

Added Application Schematic

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	=====Features and Applications=====		=====Features and Applications=====

	LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor~~\|resistor~~]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.		LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.


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			=====LEDs in a Transistor Circuit=====
			[[File:LightEmittingDiode.png\|200px\|right]]

			The most common LEDs are 5mm diameter. They glow ''(commonly red)'' when current flows through them ''(current can only flow if the anode is more positive than the cathode)''.


			The LED has a forward voltage of 2V, i.e 2 Volts is dropped across the LED when it is in operation. It requires a maximum current of 30mA. The '''[[Resistor]]''' in the circuit is included to limit the current to around this value.


			<div style="clear: both;"></div>
	{{Bulbs & LEDs Buyers Guide}}		{{Bulbs & LEDs Buyers Guide}}

DT Online at 14:11, 2 November 2016

2016-11-02T14:11:59Z

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	[[File:~~LEDschematic~~.png\|300px\|right]]		[[File:LEDs.png\|300px\|right]]
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DT Online at 14:11, 2 November 2016

2016-11-02T14:11:11Z

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	[[File:LEDschematic.~~jpg~~\|300px\|right]]		[[File:LEDschematic.png\|300px\|right]]
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DT Online: Changed Template

2016-07-03T15:27:30Z

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	{{~~Resistors/Capacitors/Diodes~~ Buyers Guide}}		{{Bulbs & LEDs Buyers Guide}}


	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Electronics Components]]		[[Category:Electronics Components]]

DT Online: Added Template

2016-07-03T13:13:44Z

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	[[File:LEDschematic.jpg\|300px\|right]]		[[File:LEDschematic.jpg\|300px\|right]]
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			=====Description=====

	[http://en.wikipedia.org/wiki/Light-emitting_diode '''Light Emitting Diodes (LED)'''] come in different colours, shapes, sizes and brightness. The more common colours being red, green and yellow.		[http://en.wikipedia.org/wiki/Light-emitting_diode '''Light Emitting Diodes (LED)'''] come in different colours, shapes, sizes and brightness. The more common colours being red, green and yellow.

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	Flashing types are available and [http://en.wikipedia.org/wiki/Seven-segment_display '''seven segment displays'''] are made of a number of LEDs in a particular pattern.		Flashing types are available and [http://en.wikipedia.org/wiki/Seven-segment_display '''seven segment displays'''] are made of a number of LEDs in a particular pattern.


			=====Features and Applications=====

	LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor\|resistor]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.		LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor\|resistor]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.
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	The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.		The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.


			{{Resistors/Capacitors/Diodes Buyers Guide}}


	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Electronics Components]]		[[Category:Electronics Components]]

DT Online at 08:18, 3 June 2015

2015-06-03T08:18:18Z

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	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Electronics ~~and Control]]~~		[[Category:Electronics Components]]
	~~[[Category:Materials and~~ Components]]

DT Online at 13:21, 1 June 2015

2015-06-01T13:21:19Z

← Older revision		Revision as of 13:21, 1 June 2015
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	[[File:LEDschematic.jpg\|300px\|right]]		[[File:LEDschematic.jpg\|300px\|right]]
	[http://en.wikipedia.org/wiki/Light-emitting_diode '''Light Emitting Diodes (LED)'''] come in different colours, shapes, sizes and brightness. The more common colours being red, green and yellow.		[http://en.wikipedia.org/wiki/Light-emitting_diode '''Light Emitting Diodes (LED)'''] come in different colours, shapes, sizes and brightness. The more common colours being red, green and yellow.


	They are also available in bi-colour and tri-colour versions. Round ones come in 3, 5 and 8mm sizes. There are also rectangular, square and bar types.		They are also available in bi-colour and tri-colour versions. Round ones come in 3, 5 and 8mm sizes. There are also rectangular, square and bar types.


	Flashing types are available and [http://en.wikipedia.org/wiki/Seven-segment_display '''seven segment displays'''] are made of a number of LEDs in a particular pattern.		Flashing types are available and [http://en.wikipedia.org/wiki/Seven-segment_display '''seven segment displays'''] are made of a number of LEDs in a particular pattern.


	LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor\|resistor]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.		LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting '''[[Resistor\|resistor]]'''. The value of this resistor is not critical but is usually within the range 100 - 330R.


	Polarity must be observed when connecting LEDs ''(it should be noted that LEDs are damaged by reverse biased voltages larger than about 6 volts)''.		Polarity must be observed when connecting LEDs ''(it should be noted that LEDs are damaged by reverse biased voltages larger than about 6 volts)''.


	The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.		The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.

DT Online: Corrected category link

2015-04-30T21:29:07Z

Corrected category link

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	[[Category:Secondary]]		[[Category:Secondary]]
	~~[[Category:Components]]~~
	[[Category:Electronics and Control]]		[[Category:Electronics and Control]]
			[[Category:Materials and Components]]

DT Online: Added category links

2015-04-28T15:17:22Z

Added category links

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	{{Secondary Electronics}}		[[Category:Secondary]]
			[[Category:Components]]
			[[Category:Electronics and Control]]

DT Online: Added Template

2014-11-16T12:42:07Z

Added Template

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	The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.		The [http://en.wikipedia.org/wiki/Anode '''Anode'''] is connected to the positive supply via the limiting resistor. The [http://en.wikipedia.org/wiki/Cathode '''Cathode'''] is connected to the negative supply.
	~~[[Category:~~Electronics]]


			{{Secondary Electronics}}