SV: [sdiy] Sine VCO

[Michael Zacherl]

Hi Niklas,

Rönnberg, Niklas wrote:

> I want linear FM, but oct/v or v/Hz is not that crucial. The cleaner sine
> the better... I'm planning to make a small additive synth, so if I can
> start from almost nothing, just the fundamental frequency, then I think I
> can make more different sound from a pure sine to quite complex sounds.
> 
> So if you have any good ideas, I will gladly discuss these with you!

after browsing through the numerous answers 
regarding your subject I've come to the 
conclusion, that for my purpose (gaining control 
of individual harmonics of the output waveform) 
I'd better go for an .. uhm ... digital approach.
:-(
Before, I was thinking of a "master circuit" 
containig CV preprocessing, exponentiator etc. 
followed by a rather large number of "slave 
oscillators" each generating a rather pure 
sinewave with a succeeding VCA.
But since I'd need at least 20 to 30 of such 
slaves for a _single_ output wave.
This is a "rather" feeble-minded idea.
So I'm going to discard it.

As far as I understood your needs, I'd go for the 
"Buchla"-approach in order to get a pretty good 
triangle and to shape it to a sine afterwards.

How many of this VCOs would you like to have in 
your system? Maybe the number of parts you'd need 
isn't that bad at all using a more conventional 
approach?


cheerio,
   Michael.