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From: "Phil Allison"
Subject: Re: low distortion oscillator
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sun, 10 Nov 2002 09:02:05 +1100
NNTP-Posting-Date: Sun, 10 Nov 2002 08:52:33 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"MIKE CONNELL" wrote in message
> > ** 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
> > when adjusting the frequency setting.
> > ........................ Phil
> My main criteria was getting distortion below .01% using cheap parts. If
> amplitude changes due to mismatch, this isn't as big a deal to me. This is
> 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 the
** I perused to item but did not buy a copy, EW is a tad dull these
days. The item was purely mechanical and consisted of two multi turn WW
pots and a system of toothed wheels and a toothed belt to link them -
IIRC - all the various bits having come from RS.
I have the notion it was one of Doug Self's contraptions.
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