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From: "Phil Allison"
Subject: Re: low distortion oscillator
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 9 Nov 2002 21:44:40 +1100
NNTP-Posting-Date: Sat, 09 Nov 2002 21:34:53 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"MIKE CONNELL" wrote in message
> There is a schematic for a cheap low distortion oscillator based on
> a Wein bridge. It is page 30 figure 40 in
> The distortion is below .003% which is pretty good compared to
> available units.
> The problem with this circuit as I see it is the dual ganged potentiometer
> that has to have each section matched to within .1%. All the other parts
> be matched to this spec fairly cheaply but not the pot.
** BTW Moderate mismatching between halves of the dual pot does
not increase the THD figure - that depends on the amplifier and the
It may however increase the tendency to *bounce* output amplitude
when adjusting the frequency setting.
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