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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
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Subject: Re: Problems with Electronics Workbench - timestep errors
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Date: Fri, 11 Oct 2002 08:06:36 +0100
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"The little lost angel" wrote in
> Okie, how about a compromise of sorts?
> You have default values or null values for settings related to the
Not for the graphs I don't. The graphs are *totally* automated, with
correct and intelligent defaults. If the runs are successful AC, DC,
TRANS, NOISE graphs will be automatically displayed and scaled to full
scale and show all signal identified on the schematic with test points.
Simple running the examples will show just how clean this is.
The issue in the original bit of this thread was that the simulation
failed. i.e. the was an error in the circuit. A attempt was then made to
view signals that did not exist.
> How about a set of presets for newbies? It would serve the same as
> having a virtual scope that will work right off the bat.
As I noted, the graphs do work right of the bat. Run the examples. The
Graphs run as is.
>And allows us
> noobs to figure out what's the difference between if we want to see DC
> voltages over a resistors with a AC/DC source, vs say AC voltages over
> a diode or something.
It a termology issue here.
When you say AC voltage over a resistor, I believe what you *really*
mean is a plot of the waveform in time. i.e. a voltage against time
graph. In spice this is achieved by a *Transient* run. In this run type
you set the specific frequency and amplitude of a time domain
generator/source, e.g. of a Sine wave, Pulse wave etc.
An "AC" run in spice is a small signal voltage/current against frequency
graph, i.e. it frequency response. In this run type you set the "AC"
field in a generator, usually to 1 Volt so that voltages plotted at
nodes are the gain referenced to that signal. The plain DC generator is
the one usually used in SS to set both a DC value and an AC value,
however, you can give an AC spec to the time domain generators such as
Sine, Square, etc.
> Yes, I realize your main thrust is for folks who know spice, who know
> their electronics. How about just making it a teeny weeny bit easier
> for noobs who wish they knew a bit more, could do a bit more but are
> still groping in the dark?
I agree, that it would be helpful to include more information on how
Spice terms relate to electronics terms.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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