PWM from Elektor.. anyone tried?

[jh]

>Has anyone built the pulse width modulator for the Elektor
>phaser at Rene Schmidtz's site? 
>
http://members.xoom.com/Rene_Schmitz/
>And, why is the PWM so complicated?
>

No, I haven't built it, but I remember well the elektor article.
I think much of it is to prevent the PW from going below 0%
of above 100%, so they did limit the LFO amplitude depending
on the manual knob position.

Developed at a time when low noise opamps and VCAs were
rarities. Can't see a good reason why one would use PWM
for a phaser today.

Just from memory, so I may be wrong.

JH.