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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 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.


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

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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