[sdiy] RC filter questions + SPICE RC filter simulation questions

[Harry Bissell]

I tried it in Electronic Workbench and got no bump... do you mean
a peak like you get in a resosnst filter, or just some odd roll-off
slope ?

H^) harry





----- Original Message -----
From: cheater cheater <cheater00 at gmail.com>
To: synth-diy <synth-diy at dropmix.xs4all.nl>
Sent: Fri, 16 Apr 2010 11:01:34 -0400 (EDT)
Subject: [sdiy] RC filter questions + SPICE RC filter simulation questions

Hi guys,
I have been playing around with pspice today, simulating and analyzing
some very simple circuits.

I analyzed a simple RC filter: AC voltage source goes through R=1kR
and C=1uF to ground. I analyzed it and got the familiar curve.

Then I stuck some more stages like that on it: there's a series of
four 1kR resistors and after each one there's a 1uF cap to ground. I
analyzed it and got the expected curve at the last stage, but the
first stage has a distinctive bump. Additionally the cutoffs of all
the stages are much lower. Where does the bump come from? Is there a
specific law that defines this?

I am trying to find a way to filter a .wav through the filter and look
at the voltage output. Is this possible to do in pspice? If not, do
any other spice packages allow that?

Thanks
D.
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-- 
Harry Bissell & Nora Abdullah 4eva