Pulse Width Multipliers

[Magnus Danielson]

> Has anyone ever built or seen a circuit similar to the "Pulse Width 
> Multiplier" article by Craig Anderton in Polyphony Jan/Feb '81?
> 
> For those not familiar, I quote from the article:
> 
> "The PW Multiplier uses four comparators, three of which have voltage
> controllable thresholds, to turn a triangle wave into a number of
> pulse waves with varying duty cycles. These pulse waves are then
> mixed together digitally via EX-OR gates, resulting in a very complex
> composite waveform."
> 
> I find it interesting because the typical timber modulator has only
> one dimension of control. 

The ring-modulation cirsuit in a MS-20 works in a similar way even thougth
the comparator voltages is fixed. The PWM knob of OSC2 will have effect 
thougth.
It's a intresting thing.

It is trivial to do a twin PW multiplier useing one standard EXOR cursuit.
I would buffer the outputs if I built it. Maybe input knobs would be nice...

This reminds me of the distorsion effect that I had in my headphone amp when I
got it selfoscillating at about 1.3 MHz... it sounded weird. For some reason
I changed the cursuit totally later... nowdays it just eats batteries :)

Magnus