Circuit Slices, LLC
Dual Parallel VCO User Manual
CS023
CS023-UM v1.0| www.circuitslices.com
1
The Circuit Slices
Dual Parallel VCO
combines two oscillators in one narrow module for
Eurorack-compatible synthesizers. The 12HP width makes it smaller than most single VCOs. It is
pre-patched, or normalled with the VCOs controlled in parallel; the FREQ knob controls both
VCOs while there are two independent fine-tune controls (FINE 1 and FINE 2). This allows
overall pitch adjustment while retaining an interesting interval or modulation effect between
the two VCOs. You may also supply separate pitch control voltages to each VCO individually, but
the PWM and FM inputs always go to both. The VCOs are high quality, matched-transistor,
temperature-compensated type with triangle, sawtooth and pulse outputs. It makes cool thick
sounds for just one narrow module.
Specifications for the Dual Parallel VCO, part number CS023
Eurorack format
Standard one-volt-per-octave pitch control
Over 10V control range
Frequency range for VCO 1 and VCO 2: 8Hz to over 32KHz
Frequency range of VCO 2 with the range switch set to “low”: 4Hz to over 16KHz
Typical pitch tracking errors for 10 octaves:
•
0.00% error for first 4 octaves
•
Less than 0.5% error for next 4 octaves
•
Less than 4% error up to the 10th octave
Outputs: Sawtooth, Triangle, Pulse
Output levels: 10Vp-p (+/- 5V)
