How can the positive and negative poles of a diode be distinguished?

How can the positive and negative poles of a diode be distinguished?

Generally speaking, the first level of colored end identification for ordinary diode is the negative electrode.

If judged by the LED, the long pin is the positive pole and the short pin is the negative pole. If they are all of the same length, the larger one inside is the negative electrode, and the smaller one is the positive electrode.

3. The conduction direction of the crystal diode PN junction is P-N, which means P-N conduction (P positive, N negative). PN junction is terminated in the correct direction.

2、 In addition, the methods for distinguishing the positive and negative poles of a diode in a printed circuit board by screen printing on the PCB board include:

4. The end with a gap is the negative electrode;

5. The end with a horizontal bar is the negative electrode;

6. The end with a white parallel bar is the negative pole;

7. One end of the triangle arrow direction is the negative electrode;

8. The small round end of the plug-in diode screen is the negative electrode, and the large round end is the positive electrode;

9. The first pin of the square hole of the plug-in LED is the positive electrode.