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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
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Old 22nd August 2014, 12:32 PM   #41
jwilhelm is offline jwilhelm  Canada
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[QUOTE=Mooly;4030525]

And just as in the first sims, hovering over circuit lines and nodes shows the DC conditions. We will elaborate on that and actually "click and attach" voltages to the diagram.
I keep getting question marks instead of voltage values. Any idea what I'm doing wrong?
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Old 22nd August 2014, 01:01 PM   #42
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
[QUOTE=jwilhelm;4033016]
Quote:
Originally Posted by Mooly View Post

And just as in the first sims, hovering over circuit lines and nodes shows the DC conditions. We will elaborate on that and actually "click and attach" voltages to the diagram.
I keep getting question marks instead of voltage values. Any idea what I'm doing wrong?
The question marks should change to the voltages when you run the simulation again. When you close and reopen the file, all the data is lost.

Make sure you have the DC op pnt selected initially and then run the simulation.

Does that work
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Old 22nd August 2014, 01:05 PM   #43
jwilhelm is offline jwilhelm  Canada
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[QUOTE=Mooly;4033034]
Quote:
Originally Posted by jwilhelm View Post

The question marks should change to the voltages when you run the simulation again. When you close and reopen the file, all the data is lost.

Make sure you have the DC op pnt selected initially and then run the simulation.

Does that work
No it doesn't. They remain question marks.
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Old 22nd August 2014, 01:16 PM   #44
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Hmmm... well go through it from the start.

I'll have to just break off for a little while first though. Back later

Try this though... attached is a basic file for the amp. Run it (close the first window of text that appears) and then left click say the collector twice and attach a voltage to the trace.

If that's OK then close the file completely, reopen it (it should show a question mark) and then run it (should revert to the voltage again)
Attached Files
File Type: asc Test DC.asc (828 Bytes, 88 views)
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Old 22nd August 2014, 01:17 PM   #45
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
When you close the file completely make sure to save the changes of course
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Old 22nd August 2014, 01:37 PM   #46
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by Mooly View Post
Hmmm... well go through it from the start.

I'll have to just break off for a little while first though. Back later

Try this though... attached is a basic file for the amp. Run it (close the first window of text that appears) and then left click say the collector twice and attach a voltage to the trace.

If that's OK then close the file completely, reopen it (it should show a question mark) and then run it (should revert to the voltage again)
It doesn't show a voltage when I initially click on it or any time after. Just three question marks. Even right beside the 12 volt source shows question marks.

Last edited by jwilhelm; 22nd August 2014 at 01:40 PM.
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Old 22nd August 2014, 02:00 PM   #47
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
OK, I'll just talk you through what I am doing... you do exactly the same.

Attached to this post is another LT file devoid of all the commands. Its called Test Two.

1/ Download and open it.

2/ Right click the workspace and select <Edit Simulation>

3/ Select the DC op pnt tab and click OK. That lets you drop the .op command onto the diagram.

4/ Right click the workspace and select <run>

5/ Close the new window that opens.

6/ Move the cursor over the horizontal trace wire that goes to the base of the transistor.

7/ Left click it slowly twice and you should be able to attach a voltage.

Do you get that far ?
Attached Files
File Type: asc Test Two.asc (804 Bytes, 69 views)
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Old 22nd August 2014, 02:03 PM   #48
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
It should look like this.
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.-test-png  
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Old 22nd August 2014, 02:06 PM   #49
jwilhelm is offline jwilhelm  Canada
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I've figured out what I'm doing wrong. My mouse is set too fast. By the time I get the second click I've moved off the wire slightly. Thanks.

Last edited by jwilhelm; 22nd August 2014 at 02:08 PM.
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Old 22nd August 2014, 02:10 PM   #50
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Excellent. A speedy mouse

(these are all useful things to know actually because if its done it for you it will do it for others too)
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