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Light Emitting Diode: Difference between revisions

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

Revision as of 13:13, 3 July 2016

LEDschematic.jpg


Description

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.


Flashing types are available and 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. 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).


The Anode is connected to the positive supply via the limiting resistor. The Cathode is connected to the negative supply.


DT Online Buyers' Guide
1/4w Resistors Pack Electrolytic Capacitors Ceramic Disc Capacitors Rectifier Diodes Photo Light Sensitive Resistor (LDR) Light Emitting Diodes (LED) Common Cathode LED Display LCD Module Display Thermistor Resistor
1/4w Resistors Pack Electrolytic Capacitors Ceramic Disc Capacitors Rectifier Diodes Photo Light Sensitive Resistor (LDR) Light Emitting Diodes (LED) Common Cathode LED Display LCD Module Display Thermistor Resistor