From: Roger Johansson
Subject: Re: Problems with Electronics Workbench - timestep errors
Date: Wed, 09 Oct 2002 22:15:01 +0200
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"Kevin Aylward" wrote:
>It don't seem like you have the generater setup correctly, or the run
>The "Sine" generator has three sets of text fields.
>1 AC spec. This should usually be set to 1 Volt so that output=gain.
>This is *only* used in AC runs. i.e. v against f
>2 DC spec. This is *only* used in DC runs. v against v
>3 Time domain spec. These are the fields for peak voltage, frequency and
>offset. This is only used for TRANS runs. V against time
>Flat AC graphs usually mean V AC is set to OV.!
>You use the blue "SS" to set up the runs i.e. AC sweep, transient range
>So, you need to make sure that both the generator *and* requested run
>are in agreement. This is true of *any* spice. You must know what it is
>you want to actually do!
In EWB we only need to know that we want to take a look at the
waveform on a certain wire, and use the oscilloscope as in reality.
We do not understand much of all the terms and settings you talk about
above, and there is no need to know.
I saw that Jim created a signal generator for spice some time ago.
That is probably very useful.
In EWB there is already a signal generator, or rather a function
generator. It is already set to default values, sinus, 1kHz, 1Volt.
So it is easy to change to what you want, but even if you do not
understand how to set it the default settings will give a signal.
That is a user friendly spice.
Most of us can look at a circuit in the common format, a circuit
diagram. But very few can read netlists and see the circuit in their
minds from that format.
The world is progressing, we develop easier interfaces, so more people
can use them.