Re: Schematic drawing issues
Thank you.
On 2025-03-08 20:41, eewiz via
groups.io 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.
?
All for now
?
?
On Sat, Mar 8, 2025 at 01:53 PM, John Woodgate
wrote:
1. I can't see
the grid points. They have always been minute
but now I can't see them at all. They used to be
more visible on print-outs of schematics.
Are you sure they are enabled?? Right-click in
schematic window > View > Show Grid.? Or Ctrl-G
should toggle them.
?
Zooming in and out MIGHT help make them marginally
more visible, but my eyes are not what they used to
be.? Changing screen colors may help too.
?
2. Drawing a
wire with CTRL held down doesn't allow the wire
to start and end off-grid. It's the same if I
draw lines instead of wires. I can't find a
'Snap to grid' check box to untick.
I am not sure, but I think "Snap to Grid" might be
always enabled for wires in the schematic viewer.?
CTRL might toggle "snap to grid" for certain objects
other than wires; and it lets? you draw wires at
angles - but to grid only.
?
3. Is there any
way to change the dimensions of a? rectangle
after it is drawn? I guess not.
I do not think so.? I always need to draw a new one.
?
Would it be
better to use the symbol drafter?
Maybe.
?
?
--
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
On Sat, Mar 8, 2025 at 01:53 PM, John Woodgate wrote:
3. Is there any way to change the dimensions of a? rectangle after it is drawn? I guess not.
To which I replied, "I do not think so".? But I'm wrong.? I was using the "Move" and "Drag" buttons incorrectly in this case.? "Move" moves the entire rectangle.? "Drag" drags only the lasso'ed portion, thus allowing its size to be changed.
?
So yes, you can change the size of a rectangle, with the "Drag" tool.
?
?
|
Re: How to flip the screen's moving direction when using touchpad?
There's a Control Panel setting to flip the mouse wheel options, try changing that. I normally have that setting checked and the touchpad on my laptop works well for me.
-- Regards, Tony?
On 8 Mar 2025 19:38, "lyulinshen via groups.io" <lyulinshen@...> wrote: My touchpad works as intended on all other platforms and the windows system itself, only flipped directions on LTspice.
|
Re: Schematic drawing issues
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.
?
All for now
?
?
Sent:?Saturday, March 08, 2025 at 3:13 PM
From:?"Andy I via groups.io" <AI.egrps+io@...>
To:[email protected]
Subject:?Re: [LTspice] Schematic drawing issues
On Sat, Mar 8, 2025 at 01:53 PM, John Woodgate wrote:
1. I can't see the grid points. They have always been minute but now I can't see them at all. They used to be more visible on print-outs of schematics.
Are you sure they are enabled?? Right-click in schematic window > View > Show Grid.? Or Ctrl-G should toggle them.
?
Zooming in and out MIGHT help make them marginally more visible, but my eyes are not what they used to be.? Changing screen colors may help too.
?
2. Drawing a wire with CTRL held down doesn't allow the wire to start and end off-grid. It's the same if I draw lines instead of wires. I can't find a 'Snap to grid' check box to untick.
I am not sure, but I think "Snap to Grid" might be always enabled for wires in the schematic viewer.? CTRL might toggle "snap to grid" for certain objects other than wires; and it lets? you draw wires at angles - but to grid only.
?
3. Is there any way to change the dimensions of a? rectangle after it is drawn? I guess not.
I do not think so.? I always need to draw a new one.
?
Would it be better to use the symbol drafter?
Maybe.
?
?
|
Re: Schematic drawing issues
On Sat, Mar 8, 2025 at 01:53 PM, John Woodgate wrote:
1. I can't see the grid points. They have always been minute but now I can't see them at all. They used to be more visible on print-outs of schematics.
Are you sure they are enabled?? Right-click in schematic window > View > Show Grid.? Or Ctrl-G should toggle them.
?
Zooming in and out MIGHT help make them marginally more visible, but my eyes are not what they used to be.? Changing screen colors may help too.
?
2. Drawing a wire with CTRL held down doesn't allow the wire to start and end off-grid. It's the same if I draw lines instead of wires. I can't find a 'Snap to grid' check box to untick.
I am not sure, but I think "Snap to Grid" might be always enabled for wires in the schematic viewer.? CTRL might toggle "snap to grid" for certain objects other than wires; and it lets? you draw wires at angles - but to grid only.
?
3. Is there any way to change the dimensions of a? rectangle after it is drawn? I guess not.
I do not think so.? I always need to draw a new one.
?
Would it be better to use the symbol drafter?
Maybe.
?
?
|
Re: How to flip the screen's moving direction when using touchpad?
It is 24.1.1.0, windows 64bit
|
Re: How to flip the screen's moving direction when using touchpad?
What version of LTspice?
?
Jim
On 03/08/2025 10:38 AM PST lyulinshen via groups.io <lyulinshen@...> wrote:
?
?
My touchpad works as intended on all other platforms and the windows system itself, only flipped directions on LTspice.
|
Re: How to flip the screen's moving direction when using touchpad?
In that case, I suggest taking the issue to
ADI's Engineer Zone.
On 2025-03-08 18:38, lyulinshen via
groups.io wrote:
My touchpad works as intended on all other platforms and the
windows system itself, only flipped directions on LTspice.
--
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
|
I am still using version 24.0.11, and I am
finding some problems with drawing a block diagram of a
multi-stage circuit as a schematic. I know that LTspice isn't
intended for that, but It's much simpler to use than some other
drafting apps. The problems are:
1. I can't see the grid points. They have
always been minute but now I can't see them at all. They used to
be more visible on print-outs of schematics.
2. Drawing a wire with CTRL held down doesn't
allow the wire to start and end off-grid. It's the same if I
draw lines instead of wires. I can't find a 'Snap to grid' check
box to untick.
3. Is there any way to change the dimensions
of a? rectangle after it is drawn? I guess not.
Would it be better to use the symbol drafter?
--
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: How to flip the screen's moving direction when using touchpad?
My touchpad works as intended on all other platforms and the windows system itself, only flipped directions on LTspice.
|
Re: How to flip the screen's moving direction when using touchpad?
If there is, it would be in the settings for
the touchpad on your computer, not in LTspice.
On 2025-03-08 17:38, lyulinshen via
groups.io wrote:
When I move the circuit graphs using mouse, it works fine,
but when I move them using two fingers on the touchpad of my
laptop, they shift the other direction (meaning when my fingers
drift left, the graph moves right, vice versa). Not to mention i
did not find a way to move the graphs up/down with touchpad too.
Is there a way to modify the settings for this?
--
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
|
How to flip the screen's moving direction when using touchpad?
When I move the circuit graphs using mouse, it works fine, but when I move them using two fingers on the touchpad of my laptop, they shift the other direction (meaning when my fingers drift left, the graph moves right, vice versa). Not to mention i did not find a way to move the graphs up/down with touchpad too.
Is there a way to modify the settings for this?
|
Model of a Piezoelectric Buzzer Module
Hello,
?
Lately, I needed to add an external piezoelectric buzzer to the internal ringer of my (bell) phone.
?
I found, in the group¡¯s archive, a circuit of Piezoelectric Buzzer, BuzFB.asc , made by analogspiceman - Aug 2012. Based on it, I made a model whose supply current is close to the one of a buzzer module I have. I added it, BuzzerModule.zip, to the group¡¯s archive (though in the ¡¯Temp folder¡¯) as a subcircuit; BuzzerModule.asc + its symbol, BuzzerModule.asy (which is just a small box with 2 pins, IN+ and IN-).
?
For instance, I built, for my ear, the low-voltage amplifier using TDA2822 (with a small electret micro and an NPN BJT pre-amp). Fortunately, it works as expected.
?
Kerim
?
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Re: defining special kind of behavioral for current controlled oscilator in ltspice
On Fri, Mar 7, 2025 at 01:50 PM, Jim Wagner wrote:
You might want to consider MODULATE rather than MODULATE2. Sorry.
They are almost exactly the same thing anyway.
?
Andy
?
|
Re: defining special kind of behavioral for current controlled oscilator in ltspice
You might want to consider MODULATE rather than MODULATE2. Sorry.
?
Jim
On 03/07/2025 9:30 AM PST john23 via groups.io <yafimvar@...> wrote:
?
?
Hello, I have a YIG device which? has two inputs.
Tune input at 2V puts my YIG to 9.4Ghz and 10dBm
FM input is current? input which moves the output 100Mhz each mili ampere.
I can measure the transfer function as a table also to see the effect of each input on the output
Is there some bahvior model in LTspice which could help me represent this device in simulation?
Thanks.
|
Re: defining special kind of behavioral for current controlled oscilator in ltspice
john23 asked:
?
Is there some bahvior model in LTspice which could help me represent this device in simulation?
?
What level of detail do you need to simulate? If it is just frequency out vs control inputs, then MODULATE2 device should be just fine. Convert the current input to a voltage (converter is called "resistor"). ?Put that in series with the Tune input voltage. Give the Modulate the appropriate scale factor(s) and output amplitude are you are in.
?
But if you need things like SWR over the tuning range, then you need a bit more.
?
Jim
?
?
On 03/07/2025 9:30 AM PST john23 via groups.io <yafimvar@...> wrote:
?
?
Hello, I have a YIG device which? has two inputs.
Tune input at 2V puts my YIG to 9.4Ghz and 10dBm
FM input is current? input which moves the output 100Mhz each mili ampere.
I can measure the transfer function as a table also to see the effect of each input on the output
Is there some bahvior model in LTspice which could help me represent this device in simulation?
Thanks.
|
Re: defining special kind of behavioral for current controlled oscilator in ltspice
Adding a bit more to this:
?
What John Woodgate is talking about, is the special function named "MODULATE" (and its counterpart "MODULATE2") which you can find by typing "MODULATE" into LTspice's component selector menu.? They are in LTspice's [SpecialFunctions] folder.? It models an ideal VCO.? Its output voltage is a sine wave whose frequency is a linear function of the voltage applied to its "FM" input pin.
?
Use that to mimic your current-controlled oscillator.? Turn your current into a voltage.? Use either a small resistor, or a B-element, or H-element (CCVS) to get from current to voltage.
?
Apply the sum of the two input signals (your "Tune" and "FM" signals) to the MODULATE's "FM" input pin.
?
To include a nonlinear transfer function, add a pre-distorter before the MODULATE device's FM pin.? It can be a B-source with a Table() function to make it nonlinear.
?
See the example circuit PLL.asc that comes with LTspice, in the ...\examples\Educational folder.? Right-click on the MODULATE device and add these two parameters to any of the Value, Value2, SpiceLine, or SpiceLine2 lines:
- mark=frequency1
- space=frequency0
where frequency0 is the VCO's frequency when the FM voltage = 0, and frequency1 is the frequency when the voltage = 1 V.? Those two set the offset and scale of the VCO's linear transfer function.? Note this refers to the voltage applied to the MODULATE device's "FM" pin, which is NOT the same as your "FM" signal you referred to in your question.
?
The MODULATE's "AM" pin should be left floating.? Or connect it to a voltage to control the sine wave's amplitude.
?
Andy
?
|
Re: defining special kind of behavioral for current controlled oscilator in ltspice
I think that the MODULATE device will do this,
but needs other devices to produce the input signals it wants,
and those? that the YIG wants, from those you have available or
are produced by the MODULATE device. I recommend a careful study
of the HELP.
On 2025-03-07 17:30, john23 via
groups.io wrote:
Hello, I have a YIG device which? has two inputs.
Tune input at 2V puts my YIG to 9.4Ghz and 10dBm
FM input is current? input which moves the output 100Mhz each
mili ampere.
I can measure the transfer function as a table also to see
the effect of each input on the output
Is there some bahvior model in LTspice which could help me
represent this device in simulation?
Thanks.
--
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
|
defining special kind of behavioral for current controlled oscilator in ltspice
Hello, I have a YIG device which? has two inputs.
Tune input at 2V puts my YIG to 9.4Ghz and 10dBm
FM input is current? input which moves the output 100Mhz each mili ampere.
I can measure the transfer function as a table also to see the effect of each input on the output
Is there some bahvior model in LTspice which could help me represent this device in simulation?
Thanks.
|
Re: LTspice vs ngspice 12AU7 tube amplifier transient analysis
On Wed, Mar 5, 2025 at 08:31 AM, Andy I wrote:
It's been ages since I checked on that.? But it might be the option ITL1 = 100.
For the tube amplifier schematic, ITS step takes 44 Direct NR iterations (totiter=44) to converge with default settings.
?
I tried to set .option ITL1=10 for .tran 0 10m analysis just to check that after the 10th iteration Direct NR gives up and switches to gmin stepping.
?
However, it looks like this is not actually the case though.
?
I asked also this on . ITL1 assigned value less than 100 (default) is actually ignored.
?
Carlo.
?
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John Woodgate
Tony Casey
eewiz
Carlo