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Quadrature sine wave VCO / state variable filter
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Manufacturer: Schlappi Engineering
Category: Keyboards & Synths
Quadrature sine wave VCO with four phase related outputs: 0°, 90°, 180°, 270°HIGH range from 10Hz to over 20kHzLOW range from 0.1Hz to over 500HzTracks volts per octave at the V/OCT inputFM1 is selectable linear or exponential FM via jumper on backFM2 is additional exponential V/OCT jackWith no input GRIND section provides voltage controlled harmonic contentWith input GRIND section compares each phase against GRIND IN signalEach slider subtracts the compared signal from the input signal, creating complex waveshapesWhen GRIND is fed into the SPIN section the outputs become a state variable filterDAMPING counteracts the oscillation and allows an external signal throughWhen filtering the four phase related outputs are: LOW PASS, BAND PASS, HIGH PASS, and INVERTED BAND PASSWhen filtering the GRIND section is a nonlinear feedback network for harsh and unpredictable timbresThe four phase feedback paths can be separately voltage controlledThe INJECT jack can be used as a second input for either audio or CV, bypassing GRINDAll analog OTA based design
18 HPPower requirements :+12V 81mA, -12V 78mA
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