S
sycochkn
Is there a binary for Spice 3f5 somewhere, that I can download, that is
compiled for windows.
Bob
compiled for windows.
Bob
sycochkn said:Is there a binary for Spice 3f5 somewhere, that I can download, that is
compiled for windows.
Ned Forrester said:I don't know about a 3f5 binary for Windows, but as a former user of the
3f5 source distribution from Berkeley, I will say that since starting to
use LTSpice free from Linear Technology, I have no plans to return to
native 3f5. LTSpice is based on 3f5, and contains the all important (to
me) arbitrary source, but has improved convergence, better front and back
ends (schematic capture and plotting), and provides behavioral models of
logic devices.
I'm not sure why you would want native 3f5.
--
NOTE: to reply, remove all punctuation from email name field
Ned Forrester [email protected] 508-289-2226
Applied Ocean Physics and Engineering Dept.
Oceanographic Systems Lab http://adcp.whoi.edu/
Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
sycochkn said:I dont need the user interface. I use AutoCAD for the graphics interface.
I use notepad for input.
Bob
Helmut Sennewald said:Hallo Bob,
Even if you work with netlists, you will be happy with
the waveform viewer of LTspice. It's much more powerful
than what you can get for SPICE 3Fx. Also LTspice is more
compatible to (P)SPICE than SPICE 3Fx.
If you don't like productive and state of the art software,
you should go with SPICE 3Fx of course.
Best regards,
Helmut
sycochkn said:I like productive state of the art software as well as anybody else. I am
a little tapped out at the moment I just spent 1200 dollars on software. I
only use spice occasionally so I would not really want to spend any money
on it I can live without the user interface.
Bob
What does iteration limit execeded mean?Helmut Sennewald said:Hello Bob,
LTspice is for free. You don't need any money to get it.
Maybe hundred thousand have it already.
Just download it from here. It's only 7MB.
http://ltspice.linear.com/software/swcadiii.exe
If you need help or jut want to look what other
people simulate, join the LTspice group.
http://tech.groups.yahoo.com/group/LTspice/
Best regards,
Helmut
sycochkn said:What does iteration limit execeded mean?
Bob
Helmut Sennewald said:Hello Bob,
This means LTspice has stopped because it couldn't find the solution.
There may be many reason for that.
Do you have a GND in your circuit? It's required in (LT)SPICE.
If the naswer is yes, firstly try the Alternate-solver.
Control Panel->SPICE->Solver Alternate.
If it still fails, you can either put the .asc-file in your reply or send
it
to me for checking.
Best regards,
Helmut
sycochkn said:transient analysis works ok. there is no model for the particular op amp
used National LM12 I just used generic parts for the moment.
Same malfunction Iteration limit reached. I guess I will make a .cir fileHelmut Sennewald said:Hello Bob,
I could solve the problem with a less ideal transistor model.
Just change the transistor models from NPN to NPN1 and PNP to PNP1.
Then add the two SPICE-lines to your schematic.
.model NPN1 NPN(VAF=100)
.model PNP1 PNP(VAF=100)
A new version is attached.
Best regards,
Helmu
Same malfunction Iteration limit reached. I guess I will make a .cir file
and see what pspice does to it.
Bob
I dont need the user interface. I use AutoCAD for the graphics interface. I
use notepad for input.
(When you hit an iteration limit, you usually have done something wrong.)
Gerhard Hoffmann said:Ooops, I took that reference to iteration limit
that you didn't want any further LTspice recommendations
Gerhard
Transient analysis seems to work fine. That is the important one to me. I
now have enough information to prototype a little 5 watt class A audio
amplifier. It only has a quiescent power dissipation of 45 watts. and peak
of 90 watts.
Class A audio power amplifiers are fairly rare. Recalculating the efficiencyGerhard Hoffmann said:Looks like it fills a badly needed void.
Gerhard
The quiescent current throught the output transistors is equal to the peakGerhard Hoffmann said:5 Watts out for 90 Watts in is more like 5.6%.
That seems a little bit excessive. PushPull Class A can reach 50%
at max. output.
A good discussion is in Douglas Self: Audio Power Design Handbook 3rd ed.
isbn 0-7506-5636-0
That said, I cannot claim to be all too rational about this topic since I
own an old
Krell KST-100 that needs 20 TO-3s to get rid of the heat.
regards, Gerhard
This should be fuped to sci.electronics.design, but I can't get Agent to
do that.
sycochkn said:The quiescent current throught the output transistors is equal to the peak
load current. one transistor/transistor bank is a constant current source
equal to the peak load current. The other transistor/transistor bank is
the driven side with a current limit of twice the peak load current.
Assume 3 amps quiescent current , 12 volts peak out 4 ohm load and rail
to rail output. Quiescent power dissipation is 72 watts max output is 18
watts rms efficiency of output stage is 25%, add the power for the losses
and driver less than 25% is the max efficiency.
Bob