[sdiy] An Improved Sine Shaper Circuit

Ian Fritz ijfritz at comcast.net
Fri Apr 17 07:35:23 CEST 2020

Hi Don--

Nice work! Thanks for showing it to us.

It seems somewhat reminescent of an older idea of adding a touch of feedback to a standard OTA shaper.  I don't remember where I first saw that, but I was able to get it to work reasonably well, ie harmonics more than 40db down. Not bad, given that the Tri was derived from a Saw core!


> On Apr 16, 2020, at 5:18 PM, Donald Tillman <don at till.com> wrote:
> Hey folks,
> I came up with a new sine shaper circuit.  It's a weird variation on old sine shaper circuit.  And it has an order of magnitude more accuracy.
> I've written it up here:
>    An Improved Sine Shaper Circuit
>    http://till.com/articles/sineshaper/
> Check it out and tell me what you think...
>  -- Don
> --
> Donald Tillman, Palo Alto, California
> http://www.till.com
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