[sdiy] An Improved Sine Shaper Circuit

David G Dixon dixon at mail.ubc.ca
Sat Apr 18 19:19:19 CEST 2020

Yes, of course.  And I tune the circuits by ear.  You can hear various
harmonics disappearing and then reappearing as you cross over the sweet

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Neil
Sent: Friday, April 17, 2020 2:26 PM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] An Improved Sine Shaper Circuit

On 4/17/20 5:12 PM, David G Dixon wrote:
> I've used Thomas Henry's version of the two-transistor sine shaper in all
> VCO designs for years (and did a bit of an optimization study to confirm
> that his resistor values were indeed optimum).  Simulation suggests that I
> can get as low as 0.57% THD with that shaper, and there is no visual
> evidence of the triangle apex leaking through.  At that level, there is
> virtually no aural evidence that it isn't a pure sine wave.

hey david, when you implement that circuit do you leave in both trimmers
(shape and symmetry)?

/// Neil Harper
/// Every Wave is New Until it Breaks

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