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Jim Thompson
Guest
Guest
Wed Jan 25, 2012 9:26 pm
On Wed, 25 Jan 2012 13:24:32 -0600, amdx <amdx_at_knology.net> wrote:
Quote:
I'm still stinging after I posted an LTspice file of a fairly simple
tuned circuit with a high impedance driver and capacitive load .
I ask for a critic, all I got was that I need to know a lot more about
electronics and that I should use a paper and pencil to do the math.
Nothing was said if there was anything good, bad, right or wrong with my
file.
Thanks for all the help,
Mikek
Huh? I don't think it was you that I told to, "Run the math rather
than your mouth"... was it ?
...Jim Thompson
I don't remember the mouth part.
Mikek
So why did you take offense? I always recommend thinking _before_
simulation.
...Jim Thompson
There you go again! :-)
I did think, I just didn't do the math cause I don't know how.
Anyway lot's of feedback, nothing about my LTspice file.
Mikek
I don't remember your LTspice file, and couldn't find it in Trash. Can
you post a Message-ID? Thanks!
...Jim Thompson
I'm not sure I want to show all my ignorance again, but as
you told me "You might actually learn something"
And since your feeling so compassionate today.
b31c3$4ed4f872$18ec6dd7$5297_at_KNOLOGY.NET
Mikek
Aha! Now I remember it. Your error is presuming impedance is always
_real_. You can evaluate "impedance" in LTspice by doing a .AC
analysis. If you're up to it I'd recommend learning complex numbers,
particularly Laplace (actually devised by Heaviside) notation which
makes such analyses much easier.
...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
amdx
Guest
Guest
Wed Jan 25, 2012 10:18 pm
On 1/25/2012 2:26 PM, Jim Thompson wrote:
Quote:
On Wed, 25 Jan 2012 13:24:32 -0600, amdx<amdx_at_knology.net> wrote:
I'm still stinging after I posted an LTspice file of a fairly simple
tuned circuit with a high impedance driver and capacitive load .
I ask for a critic, all I got was that I need to know a lot more about
electronics and that I should use a paper and pencil to do the math.
Nothing was said if there was anything good, bad, right or wrong with my
file.
Thanks for all the help,
Mikek
Huh? I don't think it was you that I told to, "Run the math rather
than your mouth"... was it ?
...Jim Thompson
I don't remember the mouth part.
Mikek
So why did you take offense? I always recommend thinking _before_
simulation.
...Jim Thompson
There you go again! :-)
I did think, I just didn't do the math cause I don't know how.
Anyway lot's of feedback, nothing about my LTspice file.
Mikek
I don't remember your LTspice file, and couldn't find it in Trash. Can
you post a Message-ID? Thanks!
...Jim Thompson
I'm not sure I want to show all my ignorance again, but as
you told me "You might actually learn something"
And since your feeling so compassionate today.
b31c3$4ed4f872$18ec6dd7$5297_at_KNOLOGY.NET
Mikek
Aha! Now I remember it. Your error is presuming impedance is always
_real_. You can evaluate "impedance" in LTspice by doing a .AC
analysis. If you're up to it I'd recommend learning complex numbers,
particularly Laplace (actually devised by Heaviside) notation which
makes such analyses much easier.
...Jim Thompson
I'm still stinging after I posted an LTspice file of a fairly simple
tuned circuit with a high impedance driver and capacitive load .
I ask for a critic, all I got was that I need to know a lot more about
electronics and that I should use a paper and pencil to do the math.
Nothing was said if there was anything good, bad, right or wrong with my
file.
Thanks for all the help,
Mikek
Huh? I don't think it was you that I told to, "Run the math rather
than your mouth"... was it ?
...Jim Thompson
I don't remember the mouth part.
Mikek
So why did you take offense? I always recommend thinking _before_
simulation.
...Jim Thompson
There you go again! :-)
I did think, I just didn't do the math cause I don't know how.
Anyway lot's of feedback, nothing about my LTspice file.
Mikek
I don't remember your LTspice file, and couldn't find it in Trash. Can
you post a Message-ID? Thanks!
...Jim Thompson
I'm not sure I want to show all my ignorance again, but as
you told me "You might actually learn something"
And since your feeling so compassionate today.
b31c3$4ed4f872$18ec6dd7$5297_at_KNOLOGY.NET
Mikek
Aha! Now I remember it. Your error is presuming impedance is always
_real_. You can evaluate "impedance" in LTspice by doing a .AC
analysis. If you're up to it I'd recommend learning complex numbers,
particularly Laplace (actually devised by Heaviside) notation which
makes such analyses much easier.
...Jim Thompson
Funny!
Mikek
Tom Del Rosso
Guest
Guest
Thu Jan 26, 2012 5:24 am
John Larkin wrote:
Quote:
Highlight this, copy, paste into notepad, save somewhere as
BasicOpamp.asc, then double-click on that file.
"Couldn't find symbol(s): UniversalOpAmp"
--
Reply in group, but if emailing add one more
zero, and remove the last word.
Tom Del Rosso
Guest
Guest
Thu Jan 26, 2012 5:34 am
John Larkin wrote:
Quote:
Highlight this, copy, paste into notepad, save somewhere as
BasicOpamp.asc, then double-click on that file.
Actually it looks like my install might be broken, because it gives me the
same thing for other asc files.
--
Reply in group, but if emailing add one more
zero, and remove the last word.
Robert Macy
Guest
Guest
Thu Jan 26, 2012 4:13 pm
On Jan 24, 10:59 am, mkr5000 <miker...@gmail.com> wrote:
Quote:
The only simulation I've ever done is with a breadboard, so I want to try out a free spice program that is well suited for a beginner and user friendly.
I may have found it with Tina TI ?
Does it only allow the use of TI parts ? (probably ok because TI has near everything).
Any other software I should look at also? thanks.
I did have electronics workbench years ago but couldn't get into it.
I may have found it with Tina TI ?
Does it only allow the use of TI parts ? (probably ok because TI has near everything).
Any other software I should look at also? thanks.
I did have electronics workbench years ago but couldn't get into it.
I recommend LTspice after the following:
After starting with PSpice which was entered using a netlist with each
component on an individual IBM card! then using Multisim's PSpice
Student version for years, then actually buying their manual for $100
[those that know me know that is an extraordinary event] was EXTREMELY
happy using text file netlist entry only. Then came schematic capture
for PSpice, which I could never get into [too much time to enter a
schematic, I could type in a netlist for a schematic carrying all in
my head faster than I could enter using all those clicks and drags and
naming and connections!!!] Then came 'workbench', or such, couldn't
even start that, so deleted from system.
Then came a model from Linear for the LT1028 low noise OpAmp, which
ACTUALLY represented the OpAmp *and* its noise!, so when LTspice
started advocating their SPICE platform, I tried it. Very intuitive,
had a lot of control of what was going on so I could trust the
answers, and the users group would answer any question within hours
24/7! BUT! TI's models often didn't work on LTspice, so I tried TINA
and found it was also intuitive, but couldn't get 'inside' TINA. After
getting some poor answers on several transient responses, I sat with
the local TI rep and had them do the simulation on their laptop
system. Using the latest greatest OS and latest greatest TINA version
their simulation failed also, Rep had no explanation and never came
back with one, so...TINA is rarely used now, instead I spend my time
modifying the TI models to operate on LTspice!
Now, Linear has sped up the simulation time to incredible speeds yet
they kept all the old PSpice formats so all my old tricks still would
work. [couldn't do those on TINA, or at least didn't know how to]
After all this history, LTspice is the PRIMARY circuit simulation
tool.
Highly recommend, join the LTspice users group.
mkr5000
Guest
Guest
Thu Jan 26, 2012 7:00 pm
Are there other libraries I can add to LTspice? I just now sat down to do a circuit and looked for an NE556 timer and it sin't there (555 is though).
Does this just come with linear technology part libraries?
Michael
Guest
Guest
Thu Jan 26, 2012 9:37 pm
On Jan 26, 9:00 am, mkr5000 <miker...@gmail.com> wrote:
Quote:
Are there other libraries I can add to LTspice? I just now sat down to do a circuit and looked for an NE556 timer and it sin't there (555 is though)..
Does this just come with linear technology part libraries?
Does this just come with linear technology part libraries?
Why not just model it as two 555s? =)
mkr5000
Guest
Guest
Thu Jan 26, 2012 10:48 pm
yep, could do that -- no big deal. are there more parts I can download from user groups etc?
teach me about spice -- when I go to other chip sites like natl, ti etc, do all these parts have models that I can download and use in LTspice?
John Larkin
Guest
Guest
Fri Jan 27, 2012 6:15 pm
On Wed, 25 Jan 2012 23:24:20 -0500, "Tom Del Rosso"
<td_03_at_verizon.net.invalid> wrote:
Quote:
John Larkin wrote:
Highlight this, copy, paste into notepad, save somewhere as
BasicOpamp.asc, then double-click on that file.
"Couldn't find symbol(s): UniversalOpAmp"
I pulled that right out of the "opamps" parts bin.
John
josephkk
Guest
Guest
Sun Jan 29, 2012 3:19 am
On Wed, 25 Jan 2012 23:34:03 -0500, "Tom Del Rosso"
<td_03_at_verizon.net.invalid> wrote:
Quote:
John Larkin wrote:
Highlight this, copy, paste into notepad, save somewhere as
BasicOpamp.asc, then double-click on that file.
Actually it looks like my install might be broken, because it gives me the
same thing for other asc files.
In the linux world .asc is currently reserved for GPG and its derivatives,
that may be depriving wine of access to the files.
?-)
josephkk
Guest
Guest
Sun Jan 29, 2012 3:22 am
On Thu, 26 Jan 2012 12:48:49 -0800 (PST), mkr5000 <mikerbgr_at_gmail.com>
wrote:
Quote:
yep, could do that -- no big deal. are there more parts I can download from user groups etc?
teach me about spice -- when I go to other chip sites like natl, ti etc, do all these parts have models that I can download and use in LTspice?
teach me about spice -- when I go to other chip sites like natl, ti etc, do all these parts have models that I can download and use in LTspice?
Lots. THe official user group on yahoo has them. Study up on how to use
them first.
?-)
Nico Coesel
Guest
Guest
Sun Jan 29, 2012 1:16 pm
amdx <amdx_at_knologynotthis.net> wrote:
Quote:
On 1/24/2012 1:11 PM, Joerg wrote:
Andy Bartlett wrote:
"mkr5000"<mikerbgr_at_gmail.com> wrote in message
news:19660259.1028.1327427998799.JavaMail.geo-discussion-forums_at_yqy38...
The only simulation I've ever done is with a breadboard, so I want to try
out a free spice program that is well suited for a beginner and user
friendly.
I may have found it with Tina TI ?
Does it only allow the use of TI parts ? (probably ok because TI has near
everything).
Any other software I should look at also? thanks.
I did have electronics workbench years ago but couldn't get into it.
LTSpice is good, use it all the time
http://www.linear.com/designtools/software/#LTspice
I'll second that. It's sort of the de-fecto standard these days. If you
get stuck you can post the LTSpice file at the end of a post right here
and ask others to take a look.
Usually within hours you'll have answers
like "Increase R17 to 12.1k and all is well".
I don't feel that's true.
I'm still stinging after I posted an LTspice file of a fairly simple
tuned circuit with a high impedance driver and capacitive load .
I ask for a critic, all I got was that I need to know a lot more about
electronics and that I should use a paper and pencil to do the math.
Andy Bartlett wrote:
"mkr5000"<mikerbgr_at_gmail.com> wrote in message
news:19660259.1028.1327427998799.JavaMail.geo-discussion-forums_at_yqy38...
The only simulation I've ever done is with a breadboard, so I want to try
out a free spice program that is well suited for a beginner and user
friendly.
I may have found it with Tina TI ?
Does it only allow the use of TI parts ? (probably ok because TI has near
everything).
Any other software I should look at also? thanks.
I did have electronics workbench years ago but couldn't get into it.
LTSpice is good, use it all the time
http://www.linear.com/designtools/software/#LTspice
I'll second that. It's sort of the de-fecto standard these days. If you
get stuck you can post the LTSpice file at the end of a post right here
and ask others to take a look.
Usually within hours you'll have answers
like "Increase R17 to 12.1k and all is well".
I don't feel that's true.
I'm still stinging after I posted an LTspice file of a fairly simple
tuned circuit with a high impedance driver and capacitive load .
I ask for a critic, all I got was that I need to know a lot more about
electronics and that I should use a paper and pencil to do the math.
Well, using pen and paper en do the math is the way electronics
problems get solved. Spice won't do that for you. Spice will only tell
you whether you did the math right or not.
--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico_at_nctdevpuntnl (punt=.)
--------------------------------------------------------------
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