[sdiy] Additive VCO

[M.A. Koot]

Oh my...
Stupid stupid...I just realized that placing opamp-adders ,after, the
expo-converter is nonsense of coarse. While that would only work at one
frequency... how dumb of me.
I guess I'd have to build expo-converters before each Sine-source then.
But the other questions still remain though. I hope there's someone familiar
with this.

cheers,
Michiel



> Hi everyone,
> 
> I'm trying to design an additive-VCO, there aren't too many around, and
> that's why I would like to at least try it myself.
> My initial idea is by having one expo-converter, having the output devided
> over several Opamp-adders (to create the harmonic-offset). Those
> Opamp-adders
> have 2 inputs each then, one with the CVin, and one with the offset
> voltage.
> Each of those opamp outputs then go to seperate Sine-VCO's, one sine for
> each opamp-output.
> Then finaly mixing all the signals together, and that should be it.
> The things I'm troubling with though, is how many harmonics (i.e.
> Sine-VCO's) should I have at least to create a decent Additive VCO? I was
> thinking of
> about 16 Sine-VCO's. 
> Another thing that popped up is: How "correct" do they have to be?
> I can assume that if you want to create fairly true additive waves, with
> Fourier in mind, they have to be pretty accurate, increasingly with the
> harmonic-number probably.. But I wouldn't know how this would be in "real
> life". 
> I hope anybody could help me, does anybody maby already have some
> experience
> in this?.
> 
> Thanks, cheers,
> Michiel
> 
> -- 
> +++ NEU bei GMX und erstmalig in Deutschland: TÜV-geprüfter Virenschutz
> +++
> 100% Virenerkennung nach Wildlist. Infos: http://www.gmx.net/virenschutz
> 

-- 
+++ NEU bei GMX und erstmalig in Deutschland: TÜV-geprüfter Virenschutz +++
100% Virenerkennung nach Wildlist. Infos: http://www.gmx.net/virenschutz