PMFoundations 6080 VCO User Manual

Hide thumbs Also See for 6080 VCO:

Download this manual

6080 VCO v1.2 – User Guide

This is the setup and user guide. The unit is designed for a modular synthesizer.

The module is designed and sized for E urorack systems. You will need a 16-10 pin E urorack power

ribbon connector with –12/0/+12 which is connected to a synth power supply. You will also need a

trimmer adjustment tool, a digital volt meter, a frequency counter and, if possible, an oscilloscope.

Calibrating the 6080-VCO Triangle, Sine and Pulse

If you bought PCBs or a kit, you should only need to calibrate the unit once. If you bought a pre-built

and tested unit, you can skip this section. Power up the device and allow it to warm up for 15 minutes.

1. Set HF Trim (R28) to 0. This is done by turning the screw counter clockwise until it hits the end

stop. A quiet click can be heard.

2. Disconnect all CV sources from the inputs.

3. Set the coarse and fine tuning controls to their center position.

4. Put a frequency counter on the SIN output.

5. Offset adjustment: A djust Offset (located on the Saw Shaper board R1) until the frequency is

16.35Hz.

Need help?

Do you have a question about the 6080 VCO and is the answer not in the manual?

Page 1 6080 VCO v1.2 – User Guide This is the setup and user guide. The unit is designed for a modular synthesizer. The module is designed and sized for E urorack systems. You will need a 16-10 pin E urorack power ribbon connector with –12/0/+12 which is connected to a synth power supply.
Page 2 6. Connect a CV source such (as a keyboard controller CV) into the 1V/octave jack. 7. VOLTS/OCTAVE adjustment: R epeatedly pay two notes one octave apart at the low end (say C2 65.4 Hz and C3 130.8 Hz) and adjust V/Oct (R18) until the frequency of the high note is exactly double that of the low note.
Page 3 5. If it hasn’t already, turn LEVEL CCW until the triangle wave displayed flips into a saw wave. 6. Now increase the frequency of the VCO to the desired maximum frequency that will be used. The saw wave will turn back into a high frequency triangle wave again. 7.
Page 4 8. Now, reduce the frequency and turn up the horizontal and vertical sweep of the oscilloscope until you can observe the center of one wave cycle, which will have a gap in it. 9. Slowly turn R23 JOIN CW until the part of the waveform above the gap and the part of the waveform below the gap are in line.