Part 3: Diode Types

There are many different type of diodes.

Rectifier diodes are designed to stop electricity from flowing in the wrong direction.

The Light Emitting Diode or LED is probably the most well known and most easily identified. The LED emits visible light when electrons cross the PN junction. It is available in several colours.

Photodiodes conduct only when they are exposed to light.

Zener diodes are designed to conduct in the reverse direction: the breakdown voltage is engineered to precise tolerances.

Schottky diodes are designed to turn on and off very rapidly when the threshold voltage is reached, providing very fast response times in digital circuits.