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gychang 9th October 2007 02:45 AM

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



head_spaz 10th October 2007 05:49 AM

Hope this helps.

gychang 10th October 2007 12:27 PM


Originally posted by head_spaz

Hope this helps.

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


AndrewT 10th October 2007 01:01 PM

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.

gychang 10th October 2007 05:56 PM

Andrew, thanks for your explanation.


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