Blue Box even better

[Peter Snow]

Hi Jules,

Is that circuit available anywhere?  
PWM on a guitar - must sound really cool!

Cheers,

Peter

Jules Ryckebusch wrote:
> 
> > Hi All. I built in the early 80's a very similar (but better) device. It
> > uses a high gain pre that runs into a comaparator, cleaning up the wave
> > form to a true square wave. Then I ran it into a 555 timer set up as a
> > monostable multivibrator with an adjustable pulse width from a resistance
> > pedal. It turns a guitar into a PWM sounding synth lead. Then you have
> > the option of increasing pulse width beyond duty cycle of the frequency
> > of the guitar note. and viola, instant octave shift. It took a lot of
> > finnese to play well but sounded neat.
> 
> Jules