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Modular Synthesizers
SCHLAPPI ENGINEERING ANGLE GRINDER
$431

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Quadrature sine wave VCO / feedback waveshaper
ANGLE GRINDER
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Description

Quadrature sine wave VCO with four phase related outputs: 0°, 90°, 180°, 270°

HIGH range from 10Hz to over 20kHz

LOW range from 0.3Hz to over 600Hz

Tracks volts per octave at the V/OCT input

FM1 is selectable linear or exponential FM via jumper on back

FM2 is additional exponential V/OCT jack

With no input GRIND section provides voltage controlled harmonic content

With input GRIND section compares each phase against GRIND IN signal

Each slider subtracts the compared signal from the input signal, creating complex waveshapes

When GRIND is fed into the SPIN section the outputs become a state variable filter

DAMPING counteracts the oscillation and allows an external signal through

When filtering the four phase related outputs are: LOW PASS, BAND PASS, HIGH PASS, and INVERTED BAND PASS

When filtering the GRIND section is a nonlinear feedback network for harsh and unpredictable timbres

The four phase feedback paths can be separately voltage controlled

The INJECT jack can be used as a second input for either audio or CV, bypassing GRIND

All analog OTA based design

Technical Specifications

  • 81 mA +12V
  • 78 mA -12V
  • 0 mA 5V

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