![]() In electronics, polarity indicates the symmetry of a component, meaning it will matter how you connect it if it’s polarized. To understand how to work with LEDs, we have to know some things about them. The color of the LED will depend on the compound used. The semiconductor die, the thing that makes LED emit light, is made from gallium arsenide (GaAs), gallium phosphide (GaP), gallium arsenide phosphide (GaAsP), silicon carbide (SiC), gallium indium nitride (GaInN), aluminum gallium indium phosphide (AlGaInP), and similar chemical compounds. A die is inside a little divot on the anvil, and the bond wire leaps from anvil to post, connecting the two.įor the light to be emitted, the diode has to be made from special material. The post is the positive side of the LED, the anode side, and the anvil is the negative side, the cathode. The inside of the LED consists of two main parts – post and anvil. This makes it more durable to fall or similar damage. ![]() The case or housing of the LED is usually made from epoxy or plastic material. If you take a closer look at an LED, you will see it’s made of several parts. ![]() They represent the light being emitted from the diode. The only difference between a diode and an LED in the schematic is the arrows added over the symbol. This similarity is reflected even in the schematic , as seen below. The only difference is that it emits light when the current passes through, as the name suggests. ![]() It allows current in only one direction and will stop it from flowing in the other. The first question that might pop into your mind is, what is exactly an LED? A regular diode is a semiconductor device that works as a one-way switch for electrical current. ![]()
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