Circuit schematic

LTspice-How to Operate Commands for a Schematic

In this article, I will introduce LTspice XVII’s “Commands for drawing schematics”.

If you want to learn how to make a circuit diagram with LTspice XVII, I recommend that you first make a circuit diagram and keep in mind while referring to the following article.

Commands on the initial screen

Menu bar

File

File Explanation
New Schematic Create a new schematic
New Symbol Create a new symbol
Open… Open existing file
New Library
-Capacitor
Create a new library of capacitor device models
New Library
-Inductor
Create a new library of inductor device models
New Library
-Resistor
Create a new library of resistor device models
Print Setup Printer settings
Print Monochrome Setting for black and white printing
“Recent Files”
Example C:¥Users¥…¥plot.defs
Open “Recent Files”
Exit Exit LTspice


View

View Explanation
Toolbar Display toolbar when checked
Status Bar Display status bar when checked
Windows Tabs Display windows tabs when checked

Tools

Tools Explanation
Control Panel Open control panel
(Various settings of LTspice are possible)
Color Preference Open color palette Editor
(Color change of the screen of LTspice is possible)
Sync Release Update of LTspice programs and model libraries

Help

Help Explanation
Help Topics Open help file
About LTspice ⅩⅤⅡ Display version information of LTspice
ShowChange Log Display LTspice’s program update history

Tool bar

Icon Tool bar Menu Explanation
New Schematic Create a new schematic
Open Open existing file
Control Panel Open control panel
(Various settings of LTspice are possible)
Search Search for letters on schematic
(The color of the corresponding part changes)

Commands on the Schematic editor

Menu bar

File

File Explanation
New Schematic Create a new schematic
New Symbol Create a new symbol
Open… Open existing file
Save Overwrite save
Save As Save as
Close Close open file
Print… Print configuration
Print Preview Print preview
Print Setup… Printer settings
Print Monochrome Setting for black and white printing
“Recent Files”
Example C:¥Users¥…¥plot.defs
Open “Recent Files”
Exit Exit LTspice

Edit

Edit Explanation
Undo Cancel operation
Redo Redo operation
Text Place text
SPICE Directive’S’ Enter dot command
SPICE Analysis Enter simulation command
Resistor Place resistance
Capacitor Place capacitor
Inductor Place inductor
Diode Place diode
Component Place various parts
(Select from “Select Component Symbol”)
Rotate Rotate parts
Mirror Flip parts
Draw Wire Draw wire
Label Net Name the node
Place GND Place GND
Place BUS tap Do the BUS wiring
Delete Delete parts and wiring etc.
Duplicate Duplicate parts and wiring etc.
Move Move parts and wiring etc.
Drag Move parts with wiring
Paste Place the copied parts and wiring etc.
Draw
-Line
Draw a line
Draw
-Rectangle
Draw a rectangle
Draw
-Circle
Draw a circle
Draw
-Arc
Draw a circular
Draw
-Line Style
Select line type

BUS Wiring

In LTspice, it is possible to make multiple wiring into BUS wiring.

1

Click “Label Net” on the toolbar.

2

Set the number of BUS wiring you want to create in the format of Net name “[0:N-1]”. For example, if you want to make “10 BUS wiring” with “Net name: BUS”, it will be “BUS[0:9]”.

3

A screen will appear asking you to confirm the BUS wiring configuration. Click “Yes”.

4

Place the Net name on the wiring that you want to make the BUS wiring.

5

Select “Edit”-“Place BUS tap”.

6

Place the trianglar BUS tap that branches the bus wiring at an appropriate position. BUS tap can also be rotated and inverted.

7

Draw the wiring from the BUS tap.

8

Place “Net name[number]” because you can not identify which line it is only by drawing a line from BUS tap. For example, the first bus wiring is BUS [0].

Hierarchy

Hierarchy Explanation
Open this Sheet’s Symbol Create symbols of circuit diagram
Create a New Symbol Create a new symbol
Create a New Sheet Create a new schematic editor

View

View Explanation
Zoom Area Zoom in
Zoom Back Zoom out
Zoom to Fit Auto scale
Pan Set reference point of display
Show Grid Display grid when checked
Mark Unconn. Pins Display empty pins when checked
Mark Anchors Display the reference point of the object when checked
Bill of Materials
-Show on Schematic
Display the bill of materials for the schematic
Bill of Materials
-Paste to clipboard
Copy the schematic bill of materials to the clipboard
Efficiency Report
-Show on Schematic
Display efficiency report
Efficiency Report
-Paste to clipboard
Copy efficiency report to clipboard
SPICE Netlist Display net list of schematic
SPICE Error Log Display log file of simulation results
Visible Traces Display waveform graph
Autorange Y-axis Autorange of Y axis scale of waveform graph
Marching Waves
-(Re-)Start
Display the waveform as it travels
Marching Waves
-Pause
Pause to display the waveform as it travels
Set Probe Reference Change the reference point of the probe
Toolbar Display toolbar when checked
Status Bar Display status bar when checked
Window Tabs Display windows tabs when checked

Simulate

Simulate Explanation
Run Start simulation
Pause Pause simulation
Halt Stop simulation
Clear Waveforms Clear waveforms
Efficiency Calculation
-Mark Start
Efficiency Calculation
-Mark End
Control Panel Open Control Panel
(Various settings of LTspice are possible)
Edit Simulation Cmd Open “Edit Simulation Cmd”

Tools

Tools Explanation
Copy bitmap to Clipboard Copy screen to clipboard in BMP format
Write image to .emf file Save schematic in emf format
Control Panel Open control panel
(Various settings of LTspice are possible)
Color Preferences Open color palette Editor
(Color change of the screen of LTspice is possible)
Sync Release Update of LTspice programs and model libraries
Export Netlist Save netlist for printed circuit board creation

Window

Window Explanation
Tile Horizontally Place the screen on the left and right
Tile Vertically Place the screen up and down
Cascade Place the screen overlapping
Close Everything Close all the screens
Arrange Icons Arrange the minimized screens(icons) on the bottom left
Schematic file currently open
Example Draft1.asc
Change schematic file

Help

Help Explanation
Help Topics Open help file
About LTspice ⅩⅤⅡ Display version information of LTspice
Show Change Log Display LTspice’s program update history

Tool bar

Icon Tool bar Menu Explanation
New Schematic Create a new schematic
Open Open existing file
Save Overwrite save
Control Panel Open Control Panel
(Various settings of LTspice are possible)
Run Start simulation
Halt Pause simulation
Zoom to rectangle Zoom in
Pan Set reference point of display
Zoom Back Zoom out
Zoom full extents Auto scale
Pick Visible Traces Display waveform graph
Autorange Autorange of Y axis scale of waveform graph
Tile Windows Place the screen on the left and right
Cascade Windows Place the screen overlapping
Close All Close all the screens
Cut Delete parts and wiring etc.
Copy Copy parts and wiring etc.
Paste
Search Search for letters on schematic
(The color of the corresponding part changes)
Print Setup Printer settings
Print Print configuration
Wire Draw wire
Ground Place GND
Label Net Name the node
Resistor Place resistance
Capacitor Place capacitor
Inductor Place inductor
Diode Place diode
Component Place various parts
(Select from “Select Component Symbol”)
Move Move parts and wiring etc.
Drag Move parts with wiring
Undo Cancel operation
Redo Redo operation
Rotate Rotate parts
Mirror Flip parts
Text Place text
SPICE Directive Enter dot command

Others

Multi monitor display

With LTspice XVII, it is possible to display screens such as the circuit diagram and waveform viewer separately. It can also be displayed on separate monitors as multiple monitors.

Right click of the mouse on the screen and check “Float Window”.

If you move the top of the screen checked in “Float Window” while pressing the left button of the mouse, you can display the screen separately as shown in the above picture.

Thumbnail display of file icon

By displaying thumbnails of LTspice’s file icons, you can check the schematics and symbols in the file.

Open the folder where the LTspice file is saved, and set the icon type to “Medium icons or more” size from “View”.

As shown in the above icons (set as an “Extra large icons”), thumbnails are displayed, making it easy to find the file.

Don`t copy text!