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Subject: Re: Problems with Electronics Workbench
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sun, 06 Oct 2002 19:35:49 GMT
NNTP-Posting-Date: Sun, 06 Oct 2002 20:35:49 BST
Organization: Ireland On-Line Customer
I consider that Electronic Workbench is an excellent program for visualising
circuits - I use it with students and within about 1 hour, from scratch,
they can see what is happening with the currents going down through
The circuit diagram capture is simple to use in EWB but does not produce
anything which could be considered as a professional circuit diagram. The
spice simulator is adaquate.
All circuit simulator programs are imperfect.. because they are based on
simplified mathematical models of the brehaviour of a real physical device
in a real world. They will give reasonable approximations to the real
thing provided that the model chosen is both realistic and appropriate. The
designer must appreciate that the programme for all its sophistication is
basically a mathemtical calculator ... One will often find it difficult to
get a oscillator to oscillate in EWB or other simulators, while the real
thing has no difficulty in bursting into oscillation.
The AC analysis progrmme in spice is the one which will particularly allow
devices to have incredibly high voltages accross them . this is because it
will take the ac small signal model for components and construct the
circuit from it.
The Transient anaylsis - scope like display is the best in this regard. it
may use the DC values.
"Paul Burridge" wrote in message
> Hi all,
> Sorry if this has cropped up before, but I've been getting some
> totally ridiculous solutions when trying to simulate circuits with EW.
> Despite the plaudits heaped upon it by the guy who wrote the manual, I
> can't see how one can just throw away the breadboard and rely upon it
> solely. The circuit in question was an RF power amp. It didn't even
> seem to recognize that 8kv was outside the working scope of a typical
> junction transistor's Vceo! Has anyone else had problems in using EW?
> Noverint universi per presentes et futuri...
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