Diodes are semiconductor components made from a P-type (or metal in Schottky diodes) and N-type material (usually silicon, but germanium, selenium, and gallium arsenide can also be used), that allow current to flow in one direction only.
There are many types of diodes:
- Rectifying diode
- Zener diode
- Signal diode
- Schottky diode
- Avalanche diode
- Photodiode
- Light Emitting Diode (LED)
- Laser diode
- Tunnel diode
- Varactor diode
- Vacuum tube diode
