[sdiy] Through zero quadrature oscillator

Guy McCusker guy.mccusker at gmail.com
Tue Oct 9 07:30:50 CEST 2018

This isn't necessarily going to help with the question but I thought
the list might enjoy poking around the web site of the designer of
that oscillator circuit, which doesn't seem to be too well known. I
found it recently after reading a post somewhere by Ian Fritz which
referred to "Henry's frequency shifter" -- a little googling turned up
this site. (Thanks Ian for the pointer!)

Section 2.2 of this page
describes the TZQVCO and includes a slightly more readable schematic.
And there are some other interesting things on the other pages.

On Tue, Oct 9, 2018 at 12:54 AM ulfur hansson <ulfurh at gmail.com> wrote:
> hello list,
> I intend to design a small synthesizer with two through zero independent sine oscillators capable of FM modulating each other.
> so far, this is the most intriguing sine core design I have found. the article that accompanies it is also pretty good :: https://we.tl/t-8OE3khwl07
> after laying out the design and building it a couple of times, the circuit fails to oscillate - however -i really like the idea of using a sine-core oscillator rather than waveshaping a triangle, and would rather continue to pursue that avenue further. the fact that this design is quadrature also is just an added bonus for me :)
> I know it is impossible for anyone to help me troubleshoot a circuit remotely - but any pointers towards more literature on through zero sine oscillator core designs, or thoughts on the above circuit design would be immensely well appreciated!
> thanks for reading,
> -úlfur
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