Programming instructions

 National Instruments Corporation 3-1 Multisim Component Reference Guide
Chapter 3
Diodes
3.1 Diode
Diodes allow current to flow in only one direction and can therefore be used as simple solid-
state switches in AC circuits, being either open (not conducting) or closed (conducting).
Terminal A is called the anode and terminal K is called the cathode.
3.1.1 Diodes: Background Information
Diodes exhibit a number of useful characteristics, such as predictable capacitance (that can be
voltage controlled) and a region of very stable voltage. They can, therefore, be used as
switching devices, voltage-controlled capacitors (varactors) and voltage references (Zener
diodes).
Because diodes will conduct current easily in only one direction, they are used extensively as
power rectifiers, converting AC signals to pulsating DC signals, for both power applications
and radio receivers.
Diodes behave as voltage-controlled switches, and have replaced mechanical switches and
relays in many applications requiring remote signal switching.
Even indicator lamps are now replaced with diodes (LEDs) that emit light in a variety of
colors when conducting.
A special form of diode, called a Zener diode, is useful for voltage regulation.
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