> Hello Alexander
>
> On 26.09.15 19:10 , Alexander Catlin-Freytag atomcf@... 1 wrote:
>
> http://www.till.com/articles/QuadTrapVCO/index.html
>
>
> What is the advantage over the A-110-4 Quadrature Oscillator
> He says, that he has to convert the Trapezoid into classic waveforms. And there is a dead simple principle, which no one
> can solve: Waveformconverters do not work with FM.
>
> Example: If we put a trapezoid-to-rectangle converter after trapezoid-FM-oscillator, we do not get the FM signal of
> rectangle oscillators. Instead we get, what a rectangle-converter makes from a FM'ed signal. And that is simply the same
> that every fuzzbox for guitar players does. I do not need a new type of oscillator that for.
>
> Florian

The main advantage are the available waveforms sawtooth and triangle. The trapezoid can be easily converted into sawtooth and
triangle by adding/subtracting.
The A-110-4 generates only sine/cosine.

Best wishes
Dieter