[sdiy] Additive Synthesis questions

[Neil Johnson]

Hi,

Paul Perry wrote:
> I can't think of a single SIMPLE sine wave generator,
> at least at audio frequencies. I suppose a phase shift oscillator
> would be about the best, but not easily voltage controlled.

Umm...

http://www.milton.arachsys.com/nj71/index.php? 
menu=2&submenu=0&subsubmenu=2

If you just want sin/cos then two gain cells and an inverter will get  
you there.

Now, getting a reasonably-sized (say, 32) bank of analogue  
oscillators to track each other with a good degree of accuracy over  
the full operating range and over full operating temperature will be  
tricky indeed.  OR get friendly with PLLs and lock everything to a  
single master that sets the overall pitch.

Neil
--
http://www.njohnson.co.uk