![]() NOTE: I took this picture myself from my camera, Please Do not mind for image clarity ,so i have put some labellings also. The larger end inside the led is -ve and the shorter one is +ve, that is how we find out the polarity of a LED As they have to be crystall clear to glow so they don’t have any labeling on it, so the only way to know is either to test it with a multimeter or by carefully observing inside the led. An RGB LED is actually three LEDs in one package each separate junction is going to have its own nominal forward voltage drop and forward current. Notice the picture carefully and compare it with the LED diode symbol, that should tell which one is –ve and +ve terminal. I hope the figure below can solve this problem of identification. Jainam Electronics Private Limited - Offering LED 5mm Multi Color Common Anode and Common Cathode Red - Green - Blue (4 Legs), High Power Light Emitting. LED's or Light Emitting Diode's don’t come with any labeling on it to identify Cathode(-ve,GND) or Anode(+ve). Due to their size, LEDs are great for unique designs and tricky lighting situations. Also, you need a combination of red, green, and blue in order to make white light. ![]() If the light needs to be white, then multiple semiconductors must be used. Sometime the diode symbol creates confusion too.Identifing a LED's the cathode and anode of a led is very easy by looking inside. Lights are typically green LEDs, red LEDs, and blue LEDs (common cathode RGB LED/common anode RGB LED). So for identification, led’s comes with a unique way to identify its terminals as Anode or Cathode. While referring to any schematic involving led's we sometimes get confused with the identification of the terminals. ![]()
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