• # EEVblog #516 – LTSPICE Tutorial – DC Operating Point Analysis

Part 1 in a series of LTSPICE tutorial videos.
In this introduction Dave explains what LTSPICE is and how to do the simplest of the SPICE analysis options – basic DC operating point analysis.
Also how to draw basic schematics, display voltages and current on your schematic, and a beginner few traps to avoid.

Forum HERE

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• V_King

Brilliant choice for the tutorial series. Been playing around with LTspice from time to time, but not always getting the results was expecting. And would not be surprised, that I am doing a lot of beginner mistakes.

Just what I needed. Looking forward to future videos.

Thanks!

• SilverSolder

Awesome idea for a tutorial Dave, thanks for doing this. Circuit simulation is such a powerful technique. Looking forward to more! 🙂

• ac

For true beginners I think the free Simetrix intro is much easier to start playing around with. LTSPICE UI is like it was designed in 1995. Though I suppose LTSPICE is much better to learn on the long term. I just can’t stand unintuitive and ugly UIs.

• Jope

>LTSPICE UI is like it was designed in 1995.

What are you talking about? Your “Simetrix” simulator doesn’t look one bit better.

Just because you didn’t bother to read one of the dozens of LTspice tutorials available for free on the web doesn’t mean the program is crap. LTspice is actually pretty easy to use if you would take the time to learn it, especially the shortcuts.

• ales

I think the best choice for total beginners is falstad’s Analog Circuit Simulator Applet: http://www.falstad.com/mathphysics.html. Easy to use, runs everywhere (only Java runtime is required), very illustrative animation of currents flowing through wires, and plenty of examples from DC rectifier bridge to PLL and many more.

• Edgar Vice

> runs everywhere (only Java runtime is required)

nice joke! This only runtime won’t ever be on any device I own/use!

LTSpice only requires an OS environment.

• Michał

You probably use Java more often than you think.

• Chris

Excellent video, looking forward to more on LTSpice analysis!

• Chris

Awesome – Thanks in advance for future videos in this series, always found LTSPice a little ‘deep’ for lack of a better term. This could get me to start using this tool. Great idea Dave.

Why is the Ground point needed?
Isn’t the ground the (-) side of the power source?

• Peter

Not necessarily- Most amplifiers have a positive and negative voltage supply, and neither can truly be regarded as ground.In this instance, ground gives the simulator a reference node- A starting point in any nodal analysis. If you were doing the sums by hand, your first task would be to identify a ground.

The precise reason? I’ll leave that to the software guys.

• Jope

You already mentioned the precise reason: you need a voltage reference point; all voltages are measured from this point.

• Name