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From: "Phil Allison"
Subject: Re: low distortion oscillator
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Date: Wed, 13 Nov 2002 16:09:18 +1100
NNTP-Posting-Date: Wed, 13 Nov 2002 15:59:30 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Roy McCammon" wrote in message
> MIKE CONNELL wrote:
> > Hi,
> > > ** BTW Moderate mismatching between halves of the dual pot
> > > not increase the THD figure - that depends on the amplifier and the
> > > stabiliser system.
> > >
> > > It may however increase the tendency to *bounce* output
> > amplitude
> > > when adjusting the frequency setting.
> > >
> > > ........................ Phil
> > My main criteria was getting distortion below .01% using cheap parts. If
> > output
> > amplitude changes due to mismatch, this isn't as big a deal to me. This
> > great if the balance between the two halves of the Wien bridge isn't
> > critical to get
> > low distortion.
> > If you do think of which Electronics World the dual pot article was in,
> > please post.
> > I'll see if I can find something about it online. I really appreciate
> > help.
> My recollection is that if the pots aren't matched,
> then low frequency noise such as 1/f noise produces
> an FM modulation.
** No, that is not true with a Wien bridge or other similar ccts IME.
Funny that some seem to think so - it can be easily tested.
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