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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <12j4LzC+fEp9EwgG@jmwa.demon.co.uk> <firstname.lastname@example.org>
Subject: Re: Problems with Electronics Workbench - timestep errors
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 9 Oct 2002 18:47:32 +0100
NNTP-Posting-Date: Wed, 09 Oct 2002 18:48:00 BST
"The little lost angel" wrote in
> On Wed, 9 Oct 2002 16:15:10 +0100, John Woodgate
> >What do you expect to get? If you expect to see a d.c. voltage across
> >R1, you won't see it with an AC analysis; you will see the full-wave
> >rectified sine wave. But maybe you aren't putting a sine wave voltage
> >into the circuit.
> Well, I've no idea. I managed to drag a DC graph out of SuperSpice but
> it either shows nothing or a gently sloping straight line.
> I've set the AC Since Wave Generator to 230 magnitude, unknown phase
> since I've no idea what it is, freq of 40 to 70Hz.
> I got a small flat straight line in the AC graph.
Ahmmm... To see a sine wave source you need TRAN not AC
> I was hoping to see a sine wave that constantly vibrates between 40 to
> 70Hz, and a DC graph that continuously update the voltage waveform
> across the resistor. And keep doing that hopefully while I experiment
> with different values or something.
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!
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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