PARASIT STUDIO Sentient Machine Build Document

SENTIENT MACHINE
Build Document last updated may 2016
for PCB version 1.0
The Sentient Machine is an LFO modulated resonant lowpass filter
with two different voices: A standard wah sound and a special
vowel type sound. At slow speeds it produces a spacey sweeping
sound reminiscent of a phaser.
The vowel voice mode is achieved by modulating an additional filter
that is tuned higher and sweeps in the opposite direction. It's a
combination of filters sometimes referred to as a formant filter.
This circuit uses PWM and CMOS switches as variable resistors
insted of vactrols or jfet's, which gives a perfectly matched set of
variable resistors and more accurate modulation at low resistances.
Happy building and playing!