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Old 9th October 2007, 02:45 AM   #1
gychang is offline gychang  United States
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Default what is bi-polar LED?

how is this different than the regular 3 legged-2 color LED?

thanks,

gychang
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Old 10th October 2007, 05:49 AM   #2
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Click the image to open in full size.

Hope this helps.
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Old 10th October 2007, 12:27 PM   #3
gychang is offline gychang  United States
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Quote:
Originally posted by head_spaz
Click the image to open in full size.

Hope this helps.

should know schematics but newbie here. what does it mean in practical terms?

gychang
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Old 10th October 2007, 01:01 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
the parallel combination conducts in both directions.
It shines a different colour when positive or negative. eg on the output of a 555 timer if the LED is returned to a mid supply voltage and the timer output is high, the LED is one colour and when output goes low the LED changes colour.

The serial pair with centre tap operates by taking the centre tap to a common voltage. Drive either LED (to the same +ve polarity) to see a choice of colour or drive both and get a colour mix.
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Old 10th October 2007, 05:56 PM   #5
gychang is offline gychang  United States
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Andrew, thanks for your explanation.

gychang
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