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From: Fred Bloggs
X-Mailer: Mozilla 4.7 [en]C-CCK-MCD EBM-Compaq1 (Win95; U)
Subject: Re: Problem with Spice simulation of Linkwitz-Riley filter
Date: Thu, 19 Sep 2002 16:35:12 GMT
NNTP-Posting-Date: Thu, 19 Sep 2002 09:35:12 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
> email@example.com (Carlos) wrote in message news:...
> > Hi all,
> > I'm having a strange problem with a Spice simulation of a Lowpass 2nd
> > order Linkwitz-Riley filter (that's two 1st order Butterworth in
> > series). I have the evaluation version of Spice, which should work ok
> > with two opamps and such a simple circuit.
> Silly me. I used as power supplies those little +5 and -5 "bubbles".
> Don't know why, but even if the opamp is spec'd for +/-5 V supplies,
> you don't want to use those. Replaced them with proper VDC sources and
> it works ok now.
Those "bubbles" are just a means to joins nets without actually drawing
interconnecting lines. You can use the "bubbles" but you have to connect
them into the power supplies somewhere, like so:
View in a fixed-width font such as Courier.
| \ | PART OF MAIN
---- | \| SCHEMATIC
| / -------
---- | /
| / |
/ / / / / / / /
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