Spice is great!...

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.
Click to expand...

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.

I have used lossy delay lines to simulate thermal systems, where the
lag between the heater and the temp sensor is diffusive. Thermal
systems have the equivalent of R and C but no equivalent of L.
 
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fredbloggs.fred@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.
Click to expand...

I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.
 
On Friday, August 18, 2023 at 7:52:37 PM UTC+1, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.

I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.
Click to expand...

Give SIMPLIS a try, you\'ll speed simulations up by an order of magnitude.
 
On Fri, 18 Aug 2023 12:04:28 -0700 (PDT), John May <sunaeco@gmail.com>
wrote:

On Friday, August 18, 2023 at 7:52:37?PM UTC+1, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.

I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.

Give SIMPLIS a try, you\'ll speed simulations up by an order of magnitude.
Click to expand...

I\'m really used to LT Spice, and it\'s great for most things. This one
case runs really slow.

One selling point for LT Spice is all the part models that are
available. How does SIMPLIS compare in that respect?

I really want 5000:1 speedup and sliders on parts so I can tweak and
see results instantly, like a breadboard with a trimpot and a scope.

Our big e/o modulator oven was slow in sim *and* in real time!
Realtime was worse. What a nuisance.
 
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fredbloggs.fred@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.
Click to expand...

The way you go about it, no amount of computing power is ever going
to be enough.

Jeroen Belleman
 
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jeroen@nospam.please>
wrote:

On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fredbloggs.fred@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
Click to expand...

The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.


Jeroen Belleman
Click to expand...

I want Spice to run on an Nvidia board.
 
On Friday, August 18, 2023 at 9:56:56 PM UTC+1, John Larkin wrote:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.



Jeroen Belleman

I want Spice to run on an Nvidia board.
Click to expand...

Spice simulators that utilise GPUs have been available for the last 15 years or more. On circuits like this with only a few few nodes they will not offer any advantage. If you\'re designing ICs with thousands of transistors the simulators from Empyrean (ALPS-GT) and Synopsys (Primetime Continuum) have got the nod of approval from the design community (feedback to Cooley)..

At the LTSpice price point there\'sa NGSpice based simulator (CUSpice) that can utilise a GPU for some spice models (IIRC caps, resistors, inductors, voltage and current sources and one or more of the Mosfet models).
 
fredag den 18. august 2023 kl. 22.56.56 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.
Click to expand...

check how bad the cpu is

https://www.cpubenchmark.net/singleCompare.php
 
On Fri, 18 Aug 2023 15:05:16 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

fredag den 18. august 2023 kl. 22.56.56 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.

check how bad the cpu is

https://www.cpubenchmark.net/singleCompare.php
Click to expand...

My computer at home died but luckily we had an identical oldish box at
work and the RAID drives moved and worked in the old box.

One of these years I\'ll need three new Win10 boxes, and maybe a spare,
with all the tools and junk installed. I\'m not looking forward to
that. Win10 is terrible and 11 is probably worse.

More RAM and more compute power would be nice.
 
lørdag den 19. august 2023 kl. 00.17.55 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 15:05:16 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

fredag den 18. august 2023 kl. 22.56.56 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much..
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.

check how bad the cpu is

https://www.cpubenchmark.net/singleCompare.php
My computer at home died but luckily we had an identical oldish box at
work and the RAID drives moved and worked in the old box.

One of these years I\'ll need three new Win10 boxes, and maybe a spare,
with all the tools and junk installed. I\'m not looking forward to
that. Win10 is terrible and 11 is probably worse.
Click to expand...

win10/11 is fine, and they can run linux too much easier when deveping for e.g. rpi or Zyng

> More RAM and more compute power would be nice.

single core performance haven\'t improved much for years
 
On Fri, 18 Aug 2023 15:42:26 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lørdag den 19. august 2023 kl. 00.17.55 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 15:05:16 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

fredag den 18. august 2023 kl. 22.56.56 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically.

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.

check how bad the cpu is

https://www.cpubenchmark.net/singleCompare.php
My computer at home died but luckily we had an identical oldish box at
work and the RAID drives moved and worked in the old box.

One of these years I\'ll need three new Win10 boxes, and maybe a spare,
with all the tools and junk installed. I\'m not looking forward to
that. Win10 is terrible and 11 is probably worse.

win10/11 is fine, and they can run linux too much easier when deveping for e.g. rpi or Zyng

More RAM and more compute power would be nice.

single core performance haven\'t improved much for years
Click to expand...

They are E5 1603 quad core 2.8 GHz. 8G ram isn\'t enough, considering
that Firefox alone can run maybe 20 processes.

Maybe the sim will run faster if I close Firefox.

I use to run the ECA circuit simulator on an 8088 at a couple of MHz!
 
lørdag den 19. august 2023 kl. 01.27.06 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 15:42:26 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

lørdag den 19. august 2023 kl. 00.17.55 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 15:05:16 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

fredag den 18. august 2023 kl. 22.56.56 UTC+2 skrev John Larkin:
On Fri, 18 Aug 2023 22:02:36 +0200, jeroen <jer...@nospam.please
wrote:
On 2023-08-18 20:52, John Larkin wrote:
On Fri, 18 Aug 2023 11:29:17 -0700, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Fri, 18 Aug 2023 10:42:16 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:

On Friday, August 18, 2023 at 10:25:58?AM UTC-4, John Larkin wrote:
On Fri, 18 Aug 2023 05:59:38 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 11:04:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 06:18:11 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Thursday, August 17, 2023 at 6:47:11?AM UTC-4, John Larkin wrote:
On Thu, 17 Aug 2023 00:11:11 -0000 (UTC), Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin <jlarkin@highland_atwork_technology.com> wrote:


While my sim is running, I can do all sorts of things. Grocery shop,
prowl the web, take a nap.

https://xkcd.com/303/

Same idea. My alternator simulator simulation (!) takes about 25
minutes to rev up, running 10 or so PPM of real time. It\'s nicely
settled in about an hour.



It’s probably pretty linear, so you could solve the DE by hand. Then you’d
have more info than a stack of sims.
It\'s a mess of PWM modulators, mosfet half-bridges, cycle-by-cycle
current limiters, 3-phase common-mode chokes, ferrite beads, about 50
bypass caps. I\'m not smart enough to do that analytically..

Unless all those subelements interact, it\'s insane to simulate the whole shebang at once.
Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.

f(t) delayed by Td is f(t-Td). Now how that works in LTSpice is another question. They do have some kind of delay function for digital subcircuits. So maybe analog->digital-> delay-> analog is the way to squeeze that into a realistic simulation.
LT Spice has both ideal and lossy transmission lines. A lossy line is
a decent model for a diffusive thing, like a thermal delay or a really
terrible PCB trace.

I think conductors inside digital ICs are essentially all diffusive, R
and C and not much L. That\'s terrible for rise time.

By diffusive I take it to mean frequency dependent time delay. That\'s much more complicated than a simple time shift. No wonder your runtime is taking forever. Do you really need to model these diffusive delays for a relay driver board??? Seems overkill.

My super slow sim now is the PM alternator simulator board, which
doesn\'t have any delay lines.

https://www.dropbox.com/scl/fi/atrtd0s0euasg0jkq3p8p/P942_23.jpg?rlkey=sis6iqz3e8uiovk3qnmvjr3gd&raw=1

That took a half hour or so to run. Even zooming on a slice of time
takes something like a minute. I guess I need to tell it to not save
so much stuff.


I tried .save of a few nodes and it didn\'t change the sim time much.
I\'m compute bound.

Zooming should improve if I don\'t save gigabytes of data.


The way you go about it, no amount of computing power is ever going
to be enough.
The way *I* go about it? How would you sim a polyphase switching
supply, simulating an alternator, driving a FADEC shorting regulator?

My old Win7 computer and LT Spice is a bit leisurely. But good enough.

check how bad the cpu is

https://www.cpubenchmark.net/singleCompare.php
My computer at home died but luckily we had an identical oldish box at
work and the RAID drives moved and worked in the old box.

One of these years I\'ll need three new Win10 boxes, and maybe a spare,
with all the tools and junk installed. I\'m not looking forward to
that. Win10 is terrible and 11 is probably worse.

win10/11 is fine, and they can run linux too much easier when deveping for e.g. rpi or Zyng

More RAM and more compute power would be nice.

single core performance haven\'t improved much for years
They are E5 1603 quad core 2.8 GHz. 8G ram isn\'t enough, considering
that Firefox alone can run maybe 20 processes.

Maybe the sim will run faster if I close Firefox.
Click to expand...

something like an i9-13900K is more than 2x single , 12x multi performance
 
On 8/17/2023 11:03 AM, John Larkin wrote:

Of course they interact!

The 200 watt floating dc/dc conveter is reasonably independent so
that\'s a separate sim. Ditto my soft-start circuit that ramps up the
raw 48v bus in to the dc/dc.

High school trig was some time ago, so I have a couple of sims to
verify the basic 3-phase math. Spice could eventually destroy all our
math skills; I use it for voltage dividers and RC timing circuits too.

Is there an anlytical way to express delay lines? I think I saw the
delay case once, in a test for PE registration as a Controls Engineer.
Click to expand...

High school trig was great, they manage to stretch sin^2(x) + cos^2(x) =
1 into a full semester of material.
 
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