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Getting Started with NI Multisim


To explore some of the main features of this software we’ ll design an IC 20W power amplifier with a LM 1875T.

After running the program Multisim opens the default capture and simulation environment:


Now let’s select the components for our amplifier

The Component Browser dialog window appears, the components are organized into Groups and Families:

In the same Component Browser window, under the label “Components”, we can search a component editing its name, in this case LM1875T

Move the mouse on the schematic and left-click once to place the component

Now place the resistors, select the Basic group and the Resistor family: we can find all commercial values and specify the type of resistor and its tolerance:


After placing the component right-click and select “90 Clockwise” or rotate before placement by using the <Ctrl-R> shortcut on the keyboard

Repeat this procedures for all resistors, then the schematic will look like this:


Now select non electrolitic capacitors

Again here we can choose between commercial values, the type and tolerance

At this point, we get this schematic


select electrolitic capacitors and place them on the schematic


To place the ground reference, go to the Source group and highlight the Power_Sources family

Place the ground references on the schematic


Now select the DC power supply

likewise select an AC signal source for not inverting terminal of OP Amp and place on the schematic:


To begin wiring, move the mouse close to a pin of a component, the mouse appears as a crosshair, place an initial wire junction by clicking on the terminal of the component and complete the wire by moving the mouse to another terminal:

the final schematic look like this:


Select the Oscilloscope from the Instruments right menu bar and place on the layout


Let’s wire the oscilloscope’s channels with the input signal and the output of the circuit


Change the color of the input channel by right-clicking on the wire and selecting the Color Segment option:

Choose for example the blue color


To run time analysis click the run button on the simulation toolbar and double click on the oscilloscope


To carry out an AC analysis, select a Measurement Probe from Instruments bar and place in the output left-clicking

From the Grapher / Analysis List on the top bar, choose AC Analysis…

Set the range of frequency

Add V(Probe 1) variable

and now click the “Simulate” button:




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