Spice newby, with request.

L

Lostgallifreyan

Guest
Hello, I decided to bite the bullet... LTspice. I'll try to fumble my own
way, as I prefer to waste my time rather than that of others, but can anyone
help set me up with a couple of models? I need LM317T regulator and also
LM317MDT (500 mA SMT type) if for any reason it performs differently in ways
Spice can model. I also need CA3140E and LF412 op-amps, and a DVD writer type
laser diode would be nice to try too. And a source of capacitors as I need to
model accounting for specific behaviours of metallised polyester and
tantalum...

If someone is willing to make a simple template for me, please do. Exploring
and editing existing known-good stuff is a faster way to learn. A simple
LM317-based regulator with a few external parts as specified in data
sheet app notes, made in LTspice, will do fine. I don't need the internals
modelled, but it has to behave like a real one. :)
 
Now sorted for the LM317 I think, but if anyone has CA3140 in files for
LTspice, please post.
 
Lostgallifreyan wrote:
Now sorted for the LM317 I think, but if anyone has CA3140 in files for
LTspice, please post.
Click to expand...

That is an RCA/GE/Intersil/Harris/Intersil (Lots of name changes over
the last 30 years) part number, so I would see if it is available on the
current Intersil website.


--
You can't have a sense of humor, if you have no sense!
 
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:4A60D291.C7431495@earthlink.net:

Lostgallifreyan wrote:

Now sorted for the LM317 I think, but if anyone has CA3140 in files for
LTspice, please post.


That is an RCA/GE/Intersil/Harris/Intersil (Lots of name changes over
the last 30 years) part number, so I would see if it is available on the
current Intersil website.
Click to expand...
Thanks, helps to know the traces, I know it's seen a lot of change. No Spices
at Intersil though. Well, 23 actually, but that suggests they don't care
about Spice much. :) I bet they do a lot more than 23 different IC's.

If there's a 'standard' modern replacement for CA3140 that you or anyone can
suggest, I can look for that too though. It has to have to-zero output swing
and be able to be a drop-in replacement for CA3140, if possible.
 
Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9C4BD8E389471zoodlewurdle@216.196.109.145:

If there's a 'standard' modern replacement for CA3140 that you or anyone
can suggest, I can look for that too though. It has to have to-zero
output swing and be able to be a drop-in replacement for CA3140, if
possible.
Click to expand...
To loosen the restrictions, no strobe pin is needed. But if it's a direct
replacement, even better. I found a recommendation for NTE7144 which looks
good. Anyone know if there's any reason NOT to use this as a general purpose
replacement for CA3140, or if there's something better?
 
On Fri, 17 Jul 2009 15:55:27 -0500, Lostgallifreyan
<no-one@nowhere.net> wrote:

Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns9C4BD8E389471zoodlewurdle@216.196.109.145:

If there's a 'standard' modern replacement for CA3140 that you or anyone
can suggest, I can look for that too though. It has to have to-zero
output swing and be able to be a drop-in replacement for CA3140, if
possible.



To loosen the restrictions, no strobe pin is needed. But if it's a direct
replacement, even better. I found a recommendation for NTE7144 which looks
good. Anyone know if there's any reason NOT to use this as a general purpose
replacement for CA3140, or if there's something better?
Click to expand...
Not large problems per se, but something you should know. NTE is
relatively expensive compared to similarly or better performing parts
that are currently available. Much of NTE stock is surplus and
overruns remarked with NTE part numbers.
 
"JosephKK"<quiettechblue@yahoo.com> wrote in
news:q13o75lsi9blgceo34o9kioetmd9e06nas@4ax.com:

To loosen the restrictions, no strobe pin is needed. But if it's a
direct
replacement, even better. I found a recommendation for NTE7144 which
looks
good. Anyone know if there's any reason NOT to use this as a general
purpose
replacement for CA3140, or if there's something better?

Not large problems per se, but something you should know. NTE is
relatively expensive compared to similarly or better performing parts
that are currently available. Much of NTE stock is surplus and
overruns remarked with NTE part numbers.
Click to expand...
I settled for an LT1215 :) Nice slew rate on that. I just plugged in my
favoured specs into Digikey's parts filter. Neat idea I should have thought
of earlier. LT1215 isn't multisourced though.. I hope some nice single-rail
op-amp with fast slew always remains part of a staple diet. I'd have liked a
FET front end but I also like what I see of that chip so far.
 
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