LEDs must be connected the correct way round, the diagram may - TopicsExpress



          

LEDs must be connected the correct way round, the diagram may labelled a or + for anode and k or-for cathode. The cathode is the short lead and there may be a slight flat on the body of round LEDs. If you can see inside the LED the cathode is the larger electrode (but this is not an official indentification method. LEDs can be damaged by heat when soldering., but the risk is small unless you are very slow.
Posted on: Tue, 02 Jul 2013 11:50:14 +0000

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