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From: firstname.lastname@example.org (Roy McCammon)
Subject: Re: low distortion oscillator
Date: Tue, 12 Nov 2002 12:34:51 -0600
X-Mailer: Mozilla 4.5 [en]C-CCK-MCD 3M/NCP 4.5 (WinNT; I)
MIKE CONNELL wrote:
> > ** BTW Moderate mismatching between halves of the dual pot does
> > 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
My recollection is that if the pots aren't matched,
then low frequency noise such as 1/f noise produces
an FM modulation.
Thank you for reading and or replying
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