Diode Construction. Diodes can be made of either of the two semiconductor materials, silicon and germanium. When the anode voltage is more positive than the cathode voltage, the diode is said to be forward-biased, and it conducts readily with a relatively low-voltage drop.. SMD diodes have a range of anode/cathode identifiers. Sometimes it's easiest to just use a multimeter to test for polarity. Turn the multimeter to the diode setting (usually indicated by a diode symbol), and touch each probe to one of the LED terminals. If the LED lights up, the positive probe is touching the anode, and the negative probe is.
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Firstly, about the symbol representing a diode schematically, the cathode is on the right side and the anode is on the left side. As a rule, consider the anode side of the schematic symbol as the arrow depicting the standard direction of current flow, i.e., positive (+) to negative (-). Hence, a diode permits the flow of current in the.. For two-terminal diodes, the cathode terminal is marked by a laser or other technique. For the diodes with three or more terminals, see the technical datasheet for the positions of cathode terminals. Fig. 1 Diode Symbol