Hw to use macspice to calculate current3/14/2023 Next you'll want to reopen the component menu and place a total of five voltage sources from the top level of the component menu (you can save time by using the copy hotkey after placing the first). You'll want to enter the "Opamps" subfolder and find the component called "UniversalOpamp2": Check the screenshot below to see the pop-up component window (and the finished circuit schematic). Press F2 to access the component menu, which is where you'll find voltage sources and op-amp models. Now we'll start placing components and simulate a simple op-amp summing amplifier. ![]() Pressing space is "zoom to fit", which sizes your viewing area nicely. Note that CTRL+Z does not undo rather, CTRL+Z and CTRL+B are used for zooming in and out, respectively. If you ever get stuck working with LTSpice, there is a pretty comprehensive set of resources available in the Help menu, including more examples regarding usage. Here is a list of some hotkeys for creating your schematic:į5: Delete (press F5 then click the component)ĬTRL+R: Rotate (when component is selected)ĬTRL+E: Mirror (when component is selected) You can find most of these on the toolbar above the circuit window, or in the "Edit" and "View" menus as well, if you prefer to access them that way. In order to actually begin drawing a schematic, you'll need to click the little red "LT" icon by the file menu (this creates a new draft):įrom here you can start placing and editing components, but first let's go over some keyboard shortcuts. Once you've installed the program and run it, you'll see a screen like the one below. To get a copy of the LTSpice executable, visit the Linear Technology design tools download page here. Recommended Levelīeginner (you should be familiar with analog circuit concepts to get the most out of this article) Getting Started In this article we'll provide an overview of AC and DC simulation, as well as how to analyze output signals. LTSpice is a versatile, accurate and free circuit simulator available for Windows and Mac.
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