Which "student" version do you have?
The slightly earlier Pspice 8.0 is reputed to be somewhat more friendly
than the latest version which I think is Orcad based wrt the schematic
capture.

I don't know of any "noisy switch" model. You'll have to generate what you
want from basic components. - E.g. drive a Vpulse from an ascii file & use
this to drive a transistor or voltage operated switch. (Sbreak)

There are limitations wrt adding new spice models but it's not too hard,
and many manufacturers now produce spice  models for their components that
are  downloadable. (Philips is a good example).

PCB layout is best left to a dedicated program like eagle. It does mean you
have to enter the schematic twice but the Pspice version gererally needs
considerable editing anyway before converting to a "real" layout. Voltage
supplies etc have to be replaced by connectors, gain blocks by real opamps
and transistor types checked for correct pinout etc. The version of Pspice
I use (8.0) is quite restrictivein  what it allows you to do as far as
generate PCB components. SMT parts are particularly restricted.
Also you ofen end up running out of components or nets as far as the
evaluation version is concerned anyway - particularly if you use a complex
opamp model etc.

Some drawing programs will produce a netlist for spice analysis as well as
perform the Schematic capture & PCB layout - protel (& Orcad ?) etc. But
these do not always have free versions. I don't know if Eagle will generate
a suitable netlist or not.


Just always be aware that you are using a model - in real life the
components will perform differently.

Richard P




Hi

Am I correct in assuming that some of you guys at least would have
experience
of PSPICE?

I've downloaded the free 'student' version, and I have a question.  I
managed
to suss out how to model a switch opening or closing after a period of
time,
but is it possible to model a 'noisy' switch change at all?

Also, PSPICE to me so far seems very good for modelling individual little
modules, but I'm not sure how I'd go about drawing the schematic for my
whole
project, ready to feed in to something to lay out a PCB - how can I put in
place a dumb 16/18pin IC to represent a PIC or any other IC not in the
library?  or a connector strip, ICP programming header?

Am I using the wrong tool for what I need?

Regards,
Mark





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