Angle Grinder is a quadrature sine wave oscillator or filter and distortion effect.
The function of the Angle Grinder depends on both the position of the knobs and the presence of an input signal.
![](https://cdn.shopify.com/s/files/1/0549/4538/2479/files/angle_grinder_block_diagram_20180706-01_480x480.jpg?v=1639403864)
Features:
- 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 500Hz
- Tracks 4+ octaves of volts per octave at the V/OCT input
- FM1 is linearFM
- 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
- 18 HP
- Power requirements :+12V 81mA, -12V 78mA
Download quickstart guide here
Download manual here