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Old 17th May 2013, 05:34 PM   #21
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I use both LTSpice and Simetrix free. Both do not make neat diagrams by default, requiring some experience in drawing logically and editing text label positions.
Simetrix free has limitations on circuit complexity and libraries, but the full version is too expensive for home use.
I find the Simetrix FFT hard to control to get useful frequency ranges and resolution
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Old 17th May 2013, 05:41 PM   #22
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Quote:
Originally Posted by davidsrsb View Post
Simetrix free has limitations on circuit complexity and libraries...
You can include your component models in the free version of Simetrix with greater ease than with any other SPICE program
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Old 17th May 2013, 08:33 PM   #23
benb is offline benb  United States
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Unfortunately, I learned Pspice many years ago, and it just shows how badly LTspice is at, for a basic example, drawing a wire. I've been using LTspice for years now, but did a demo of LTspice a few month ago and was reminded about how to run a wire when the person next to me was having big troubles trying to follow what I was doing - you can only go one (ordinal) direction at a time, then click, and from that point you can go another direction. You have to click at every point you want to change direction. I had forgot such little details, but once I told everyone about it, we were on to the next nonstandard thing about LTspice's GUI.

It can read a standard schematic file generated by another program, but switching between programs is just another pain. The strength of LTspice (in addition to it being free) is in decent simulation, and that's why people (like me) put up with the GUI.
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Old 17th May 2013, 09:05 PM   #24
rdf is offline rdf  Canada
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Originally Posted by godfrey View Post
Imagine a computer operating system that looks at first glance exactly like Windows. Except that to get it to actually do anything, you have to type DOS commands directly....
AutoCAD?
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Old 17th May 2013, 09:25 PM   #25
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Default LTSpice is prety easy to use

It just takes a bit of getting used to like any SW with commands/shortcut keys.

I do wish that node voltages and node numbers could be annotated on the schematic though.

For free however it's bloody amazing.

Matt
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Old 17th May 2013, 09:47 PM   #26
jcx is offline jcx  United States
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you can see DC operating point solution I, V by hovering over the schematic node/device pin following a sim


the Yahoo users group is the semi-official support community

this can be of use too Undocumented LTspice - LTwiki - Wiki for LTspice
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Old 20th May 2013, 04:58 AM   #27
benb is offline benb  United States
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Quote:
Originally Posted by soundchaser001 View Post
It just takes a bit of getting used to like any SW with commands/shortcut keys.

I do wish that node voltages and node numbers could be annotated on the schematic though.

For free however it's bloody amazing.

Matt
You can NAME any node with the little thing between the ground symbol and the resistor, and all nodes with the same name are tied together. I often use names such as +15V and -15V for the rails in opamp circuits. If it's a node with a varying or unknown voltage, I suppose you could add text with the node voltage after doing a sim.
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Old 20th May 2013, 09:27 AM   #28
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Old 20th May 2013, 09:29 AM   #29
Bonsai is offline Bonsai  Taiwan
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Old 20th May 2013, 10:39 AM   #30
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by benb View Post
how badly LTspice is at, for a basic example, drawing a wire.
...on to the next nonstandard thing about LTspice's GUI.
I remember when I first tried LTSpice, I started out full of confidence, which lasted about 5 minutes.

Step 1: place a couple of components. So far, so good. Now I want to rotate one and move the other a bit to the side. Bloody hell! An hour+ of digging through the help file before I figured out how to do that.

Click and drag - forget it.
Click an object to select it - forget it.
Left click does nothing, double click does nothing. Wait a minute, is this even a GUI in the normal sense of the word?

OK, right clicking an object allows you to change some properties - now we're getting somewhere. But wait, that's only a limited subset of the properties. Aaaargh! Another hour+ with the help file to find out how to access all the properties.

After several days, I managed to get moderately proficient at drawing a circuit and running a sim, but it was still a painfully slow and awkward process.

Then I found SIMetrix and never looked back. About 20 minutes to reach the same level of proficiency, without having to consult the help - it just works, the way you'd expect any modern software to. Easy and intuitive.

Quote:
Originally Posted by Bonsai View Post
Yeah! LTSpice rocks man!
I wouldn't go quite that far just yet, but I'll (begrudgingly) upgrade my opinion to "barely usable, if there wasn't an alternative".

Quote:
Originally Posted by jcx View Post
the Yahoo users group is the semi-official support community
You say that like it's a good thing. If the interface wasn't so non-standard, quirky and counter-intuitive, there'd be no need for a support community.

Last edited by godfrey; 20th May 2013 at 10:52 AM.
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