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This module provides a brief introduction to electrical and electronic components available in National Instruments Multisim. Multisim is fully featured SPICE schematic capture and simulation tool used for circuit design, simulation, and in combination with Ultiboard for layout of custom PCBs.

Components

Components overview

Components comprise the basis for any schematic. A component is any part that can be placed onto theschematic. Multisim defines two broad categories of parts: real and virtual. It is important to understand the difference between theseparts, in order to fully utilize their advantages.

Real components can be differentiated from virtual parts because real components have a specific value thatcannot be changed, and a PCB footprint.

Virtual components are simulation-only components, which can be assigned user-defined characteristics. Forexample, a virtual resistor can take on any resistance (such as 3.86654 Ohms). Virtual components help designers to checkcalculations by simulating designs with precise component values. Virtual components can also be idealized components such as the4-pin Hex display shown in Figure 1.

Multisim also provides other classifications of components: analog, digital, mixed-mode, animated, interactive,multi-section digital, electromechanical, and radio-frequency (RF) components.

Various Component Symbols: 7-Segment Display, Diode D1, Voltage Source V1, NAND gate U2A,Microcontroller U3 and Transistor Q1

Interactive components

Multisim provides a method for interacting with certain components that are placed on the schematic. Changesto these components will affect the simulation results on-the-fly. Components are controlled by pressing the key listed beside thecomponent.

For the components shown in Figure 2 below, pressing the A keywill increase the resistance of the potentiometertoward 100% of the shown value (1kΩ); to decrease the resistance, hold the Shift key then press the A key. Pressing the Spacebar willtoggle the switch to be either closed or open.

The keyboard shortcut key can be changed by double-clicking on the component, and choosing the desired key fromthe drop-down box as shown below.

Examples Interactive Components

Component characteristics

The following fields are visible from the Component Browser.

Component Information

The component browser

The Component Browser is used to select components for placement onto the schematic. To access theComponent Browser, click on any icon in the parts bin, or select Place/Component. The default keyboard shortcut to place a componentis Ctrl-W.Double-click on the desired component to place it on the schematic. The component will“ghost”the mouse cursor until the left mouse button is clicked again to place the component.

The Parts Bin or Component Toolbar
The Component Browser

To search this view, simply start typing the name of the desired component, and the browser will automaticallydisplay matching candidate parts. Optionally, for a more detailed search, click on the Search button.

The Component Browser shows the current database in which the displayed parts are stored. Multisimorganizes the parts by group, and family. The browser also shows the symbol, a description of the component in the Function field,the model, and the footprint / manufacturer.

The wildcard character‘*’can be used to match any set of characters. For example“LM*78”would match components“LM*AD”would return both“LM101AD”and“LM108AD”, among others.

Note:Any component may have multiple models associated with it. Each model may account for varying physicalcharacteristics of the component. For example, the LM358M opamp has five visible pins, but only three of them are used in one model,ignoring the power supply terminals. More information about models can be found by selecting the desired model from the ModelManuf.\ID field, and click on the Model button.

Databases

There are three levels of database provided by Multisim:

  • The Master Database is read-only, and contains components supplied by Electronics Workbench.
  • The User Database is private to the individual user logged onto the computer. It is used for components built by an individualthat are not intended to be shared.
  • The Corporate Database is used to store custom components that are intended to be shared across an organization. TheCorporate Database can be shared on a network.

Database management tools are supplied in order to move components between databases, merge databases, andedit them. All the databases are divided into groups and then into families within those groups. When a designer chooses a componentfrom the database and drops it onto the circuit, a copy of the component is placed onto the circuit. Any edits made to thecomponent in the circuit do not affect the original database copy.

Edits made to the component in the database do not affect the previously placed components, but will affect allsubsequently placed components of that type. When a circuit is saved, component information is saved in the Multisim file. Onload, the user has the option to keep the loaded parts as is, to make copies to place into their user or corporate database, or toupdate similarly-named components with the latest values from the database. Note: The Database Manager can be opened by selecting Tools/Database/Database Manager. To edit Master Database parts,copy them to the User or Corporate Database.

Database Manager

Creating custom components

Multisim includes the ability to create and edit components to satisfy the needs of any design. The two methodsavailable are the Component Wizard, and the Component Properties dialog box.

To access the Component Wizard, select Tools/Component Wizard. The component wizard allows designers toenter all pertinent component information, such as symbol, and SPICE model (Figure 7).

To access the Component Properties dialog box, double-click on a placed component, click on the Value tab, andclick the Edit Component in DB button (Figure 8).

Component Wizard

Component Properties Dialog Box

More details on creating custom components are available in the helpfiles.

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
Berger describes sociologists as concerned with
Mueller Reply
what is hormones?
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Source:  OpenStax, Introduction to multisim schematic capture and spice simulation. OpenStax CNX. Sep 26, 2006 Download for free at http://cnx.org/content/col10369/1.3
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