LT Spice Tutorial: Creating Circuits & Simulations for Electrical & Electronics Students, Study notes of Engineering

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ELECTRICAL AND ELECTRONICS

ENGINEERING

TUTORIAL

LT SPICE

Version 1.

-----PART 1-----

Fig.1. LT Spice Opening Screen

Fig.2. LT Spice New Schematics Opening Screen

Begin a new circuit by clicking the “New Schematic” button

This window presents all components in standard library at the “Top Directory”.

Add text for searching the desired component, for this application write “voltage” for voltage source.

The all components are displayed in this box. The number of devices will be changed with the searching keyword

Symbol of the component

Select voltage and press OK.

Left click to put selected device on the workspace. It is possible to place same components as many times as desired by left clicking. To cancel this device press right click

Now, we can assign voltage level by right clicking the device.

Give the voltage level 10V from “DC value (V)”

V will be changed to 10V

Repeat the same procedure for resistor

Press run, you will see “Edit Simulation Command” window.

Select “DC op pnt” and press OK.

V(n001) our first voltage source has value of 10 voltage

I(R1) is the current on the resistor. It is assumed that the polarity of the terminal of the device on the ground assumed to be negative. Therefore I(V1), which is the current on the voltage source is negative.

-----PART 2-----

Construct the circuit below from the knowledge gained in SECTION-

RIGHT CLICK TO C1 FOR THE CAPACITOR VALUE.

Add capacitor

from this button

CLICK ADVANCED BUTTON FOR VOLTAGE

SOURCE PROPERTIES

PRESS RUN FOR SIMULATION COMMAND

Now, we can run this simulation for 0.5 sec. (transient). You can observe the signal amplification as magnitude of 10.

Select SPICE Directive and enter

the command:

.lib opamp.sub

References [1] http://www.simonbramble.co.uk/lt_spice/ltspice_lt_spice_tutorial_1.htm [2] http://www.linear.com/designtools/software/demo_circuits.php [3] http://eecs.oregonstate.edu/education/docs/tutorials/LTSpiceIntro.pdf