Part 4: Diode Applications
is a simple device, the diode has many applications in electronics.
protection: It is often inserted in a circuit to protect other
components from damage due to reverse voltages.
One or more diodes can be used to change alternating current
into direct current. They are often used in inexpensive power supplies
designed to operate electronic equipment powered by DC using the
AC power from a standard wall receptacle.
Four diodes can be connected together to create circuit which
will utilize both the positive and negative halves of the AC cycle
for power. They are available in a special package with four pins
for use power supply circuits.
LEDs are often used to display information in electronic circuits,
including the simple "power on" indicator and simple numerical
and text display devices.
Sensing: Photodiodes have many applications. In the simplest
form, they can be used to turn a light on when darkness falls, but
they are often used in control circuits as well, such as the photoelectric
eye found in most elevator doors to detect the presence of someone
in the doorway.