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Chapter 1
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Der Strippenstrolch - Leuchtdiode (LED)
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LED tutorial: "shorter anode pin should be connected to positive". Eh?! WTF? - General Electronics - Arduino Forum
Light Emitting Diode: LED - ppt download
How to check (understand) Led positive and negative terminal - YouTube
What is LED?
Why are some LEDs polarized and some aren't?( by polarized I mean having an anode and a cathode) - Quora
Diode Plus Minus
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Diode as a circuit element (article) | Diode | Khan Academy
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