Re: Schematic drawing issues
On Mon, Mar 10, 2025 at 11:25 AM, Andy I wrote:
IMO, it is odd that Stretching the rectangle's corner marker is ineffective.? It must involve drawing a lasso around it first, or nothing happens.? That is not intuitive.? Consider improving this.
?
Andy
Considered and done! Actually, no change needed, you can already do this by clicking an anchor, or node, or component—no lasso required.
?
Apologies for this oversight in my instructions.
?
mike
--
Michael Stokowski
LTspice Team
Analog Devices Inc.
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Re: Schematic drawing issues
On Mon, Mar 10, 2025 at 11:57 AM, Andy I wrote:
Sounds like you've got a bad UI problem there.
Sorry, I forgot to provide context.? I was referring to the UI of ADI's Engineer Zone, making it appear as if a new message post could not be completed without a schematic.? Requiring to click "post" after clicking "post" seems counter-intuitive.
?
Andy
?
Agreed. Apparently, hard to do it “the right way” because EZ has to serve 1000s of products that are not software, and those not-software products steer the ship. Believe me, I've tried to improve the Q&A posting interface to accommodate LTspice. Not giving up.
--
Michael Stokowski
LTspice Team
Analog Devices Inc.
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Re: Schematic drawing issues
On Mon, Mar 10, 2025 at 03:01 PM, John Woodgate wrote:
I'd like the default colours to nearly follow the resistor colour code, ...
That is essentially what I used too.? But I diverged somewhat from the resistor colour code sequence to make them more visible.??It is interesting that you use a light grey background for better contrast.? I should try that.? Thanks for the tip.
?
but with black as 10, pink as 11 and cyan as 12, so I've set it up that way.
Does this mean you re-use black?? Or are they different shades for 1 and 10?
?
?
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Re: Schematic drawing issues
Now I have it the other way round, white for
schematics (so they print out that way), and light grey for
waveforms to get better colour contrast. I'd like the default
colours to nearly follow the resistor colour code, but with
black as 10, pink as 11 and cyan as 12, so I've set it up that
way.
On 2025-03-10 18:49, Andy I via
groups.io wrote:
On Mon, Mar 10, 2025 at 05:00 AM, John Woodgate wrote:
.... I have to print to
.JPG, ...
I don't have a Windows driver to print to JPG.? I can print to
PDF, and can go from there to a JPG or GIF or PNG but it's
cumbersome.
?
I forgot to mention that I always use a white background on
my LTspice screen (light grey for the schematic screen).? I
never liked the default black background for waveforms, so it is
the first thing I change whenever installing LTspice.
?
Andy
?
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
|
Re: Schematic drawing issues
I wrote:
Sounds like you've got a bad UI problem there.
Sorry, I forgot to provide context.? I was referring to the UI of ADI's Engineer Zone, making it appear as if a new message post could not be completed without a schematic.? Requiring to click "post" after clicking "post" seems counter-intuitive.
?
Andy
?
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Re: Schematic drawing issues
On Mon, Mar 10, 2025 at 05:00 AM, John Woodgate wrote:
.... I have to print to .JPG, ...
I don't have a Windows driver to print to JPG.? I can print to PDF, and can go from there to a JPG or GIF or PNG but it's cumbersome.
?
I forgot to mention that I always use a white background on my LTspice screen (light grey for the schematic screen).? I never liked the default black background for waveforms, so it is the first thing I change whenever installing LTspice.
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Andy
?
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Re: Schematic drawing issues
Well, the message seems to be an executive
order, not to be disobeyed. Perhaps it could be re-worded, like
'If your question is about a specific schematic, it can't be
answered unless you upload the schematic (.ASC file) for
examination. If it is not about a specific schematic, press POST
again'
On 2025-03-10 18:07, mstokowski via
groups.io wrote:
On Mon, Mar 10, 2025 at 06:12 AM, John Woodgate wrote:
So I tried. You can't use
the word 'schematic' in a question without uploading a
schematic! This is not sensible. I worked round it by
writing 'circuit diagram' instead. Three cheers for
British English!
On 2025-03-10 12:56, John
Woodgate wrote:
Thanks, Tony. I will
try.
On 2025-03-10 12:50, Tony Casey
wrote:
You have to
start a discussion and title it "Feature Request, or
similar.
--
Regards,Tony
?
?
As
someone who has to often ask for schematics, I wish that this
was the case. :-) Actually, when you create any Engineer Zone
post with LTspice as the product, as soon as you click Post, a
pop-up appears asking for any related files — i.e. schematics,
symbols, etc — since the vase majority of cases require one
for debugging. Obviously, feature requests like this, do not.
When you close that pop-up, it does not reappear, assuming you
got the message. It is only a message, not a hard stop, though
it looks like one. You do not need to remove instances of
“schematic”, simply click Post again. Essentially, that is
what you did, but you also changed your post to read “circuit
diagram”.
?
mike
-
Michael Stokowski
LTspice Team
Analog Devices Inc.
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
|
Re: Schematic drawing issues
IMO, it is odd that Stretching the rectangle's corner marker is ineffective.? It must involve drawing a lasso around it first, or nothing happens.? That is not intuitive.? Consider improving this.
?
Andy
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Re: Schematic drawing issues
Raise your hand if you feel changing hotkeys was anything short of a dumb idea.
?
It's been said before too.
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Andy
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Re: Schematic drawing issues
Sounds like you've got a bad UI problem there.
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Andy
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Re: Schematic drawing issues
On Sat, Mar 8, 2025 at 12:41 PM, eewiz wrote:
As for #3 below;
Hit the "S" key.
Drag a box around an entire edge of a rectangle, top to bottom, or right to left.
Drag that edge of the rectangle to a new desired position.
“Drag” is now “Stretch”, hence the “S”. Raise your hand if you felt there is enough distinction between the words “Drag” and “Move”. Feels like one is simply a more specific description of the other.
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Just to clarify the instructions. There are two points that can be dragged to stretch the rectangle, namely the upper left corner of the rectangle, or the lower right corner. You simply drag a box around either of these two points, no need to select the entire edge.
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For fun, or not fun, with the Stretch tool active, drag a box around the entire rectangle; the action is now a Move.
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mike
?
--
Michael Stokowski
LTspice Team
Analog Devices Inc.
|
Re: Schematic drawing issues
On Mon, Mar 10, 2025 at 06:12 AM, John Woodgate wrote:
So I tried. You can't use the word 'schematic' in a question without uploading a schematic! This is not sensible. I worked round it by writing 'circuit diagram' instead. Three cheers for British English!
On 2025-03-10 12:56, John Woodgate wrote:
Thanks, Tony. I will try.
On 2025-03-10 12:50, Tony Casey wrote:
You have to start a discussion and title it "Feature Request, or similar.
--
Regards,Tony
?
?
As someone who has to often ask for schematics, I wish that this was the case. :-) Actually, when you create any Engineer Zone post with LTspice as the product, as soon as you click Post, a pop-up appears asking for any related files — i.e. schematics, symbols, etc — since the vase majority of cases require one for debugging. Obviously, feature requests like this, do not. When you close that pop-up, it does not reappear, assuming you got the message. It is only a message, not a hard stop, though it looks like one. You do not need to remove instances of “schematic”, simply click Post again. Essentially, that is what you did, but you also changed your post to read “circuit diagram”.
?
mike
-
Michael Stokowski
LTspice Team
Analog Devices Inc.
|
Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
What is 'MNA', please?
Modified Nodal Analysis.
?
No, it is not something everyone ought to know!
?
?
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
What is 'MNA', please?
On 2025-03-10 16:48, Carlo wrote:
On Mon, Mar 10, 2025 at 09:03 AM, Andy I wrote:
?
But does it start with initial voltages, or with initial
currents, as the first step?? I can't even say that much.
From the fact that the MNA system is based on node voltages as
unknowns (including currents for voltage sources) and there
exists the .NODESET directive for node voltages to aid NR
convergence, I believe the first NR iteration is done using
hints (or zero) for devices'voltage.
?
Carlo.
?
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
|
Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
On Mon, Mar 10, 2025 at 09:03 AM, Andy I wrote:
?
But does it start with initial voltages, or with initial currents, as the first step?? I can't even say that much.
From the fact that the MNA system is based on node voltages as unknowns (including currents for voltage sources) and there exists the .NODESET directive for node voltages to aid NR convergence, I believe the first NR iteration is done using hints (or zero) for devices'voltage.
?
Carlo.
?
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
On 3/4/25 12:36 PM, Carlo wrote: I've no idea why their ITS solutions are so different though... * Heater model * * Can be operated from AC or DC power sources. * NB: When operating from DC power sources, "Skip initial transient * solution" must be checked, to make use of this model. * You can beat your brain in as much as you want but you might want a different model. Maybe even the NH12AU7 model which doesn't include the heater. Connect the LM317 to a resistor stand in for the heater. -- David Schultz "The cheeper the crook, the gaudier the patter." - Sam Spade
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Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
On Mon, Mar 10, 2025 at 06:33 AM, Carlo wrote:
... Without any .NODESET statement I believe the NR initial "guess/hint" for devices' voltage is actually zero.
?
Can you confirm my understanding?
Not being intimately familiar with the inner workings, I can not confirm anything.
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But I will agree with the assumption that the initial guess about every node voltage - except for those actually driven by independent voltage sources - probably is zero.? I think it would not be sensible to start with voltages other than zero, would it?
?
But does it start with initial voltages, or with initial currents, as the first step?? I can't even say that much.
?
Andy
?
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Re: Schematic drawing issues
So I tried. You can't use the word 'schematic'
in a question without uploading a schematic! This is not
sensible. I worked round it by writing 'circuit diagram'
instead. Three cheers for British English!
On 2025-03-10 12:56, John Woodgate
wrote:
Thanks, Tony. I will try.
On 2025-03-10 12:50, Tony Casey
wrote:
You have to start a discussion and title it "Feature Request, or
similar.
--
Regards,
Tony
On 10/03/2025 12:51, John Woodgate wrote:
It
is black if the background is set to white, as I have it, but
the default background is black. The white dots are no more
visible. How do I ask ADI to consider a larger dot option, or
a grid option? I looked on EZ, but I don't see anything but
discussions.
--
OOO - Own Opinions only If something is true: * as far as we
know - it's science *for certain - it's mathematics
*unquestionably - it's religion
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
|
Re: Schematic drawing issues
Thanks, Tony. I will try.
On 2025-03-10 12:50, Tony Casey wrote:
You have to start a discussion and title it "Feature Request, or
similar.
--
Regards,
Tony
On 10/03/2025 12:51, John Woodgate wrote:
It
is black if the background is set to white, as I have it, but
the default background is black. The white dots are no more
visible. How do I ask ADI to consider a larger dot option, or a
grid option? I looked on EZ, but I don't see anything but
discussions.
--
OOO - Own Opinions only
If something is true:
* as far as we know - it's science
*for certain - it's mathematics
*unquestionably - it's religion
|
Re: Schematic drawing issues
You have to start a discussion and title it "Feature Request, or
similar.
--
Regards,
Tony
On 10/03/2025 12:51, John Woodgate wrote:
toggle quoted message
Show quoted text
It is
black if the background is set to white, as I have it, but the
default background is black. The white dots are no more visible.
How do I ask ADI to consider a larger dot option, or a grid
option? I looked on EZ, but I don't see anything but discussions.
|
John Woodgate
Carlo
Tony Casey