SCHLAPPI ENGINEERING Angle Grinder - Page 3

SCHLAPPI ENGINEERING
Angle Grinder is a quadrature sine wave oscillator, lter, and waveshaping eect.
The SPIN section is a quadrature sine wave oscillator.
The GRIND section compares each phase against input signal, then subtracts the result from the input signal.
If the spin section is either damped enough or enough signal is fed into it from the grind section
then it will stop oscillating and become a state variable lter (of sorts).
IN
Insert audio or cv here
OUT
Output from GRIND
GRIND SLIDERS
Mixes the amount of signal to grind
from the associated SPIN output
Feedback playground
SPIN
Coarse tuning control
GRIND CV
CV control added to associated GRIND SLIDER
SPIN OUTPUTS
Four phase related outpus
0°, 90°, 180°, and 270° if oscillating
LOW PASS, BAND PASS, HIGH PASS, and INV BAND PASS if ltering
GRIND -> SPIN
Feeds the output of GRIND
into SPIN (lter/osc)
FINE
Fine tuning control
DAMPING
Counteracts oscillations
FM 1
CV attenuator
switchable betwean linear
and exp by header on rear
RANGE SWITCH
LOW 0.1 Hz to 500Hz
HIGH 10 HZ to over 20kHz
INJECT
Direct input to SPIN
AC coupled on header
for soft sync-like eect
V/OCT
Volts per octave cv control
over SPIN
FM 2
Exponential CV control over SPIN
PANEL CONTROLS
*FM1 is normalled to GRIND OUT for easy noise making
but you will want it turned down for tracking pitch if there
is no cable plugged into it
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