PMFoundations 3080 VCO User Manual

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3080 VCO v1.2 – User Guide

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

The module is designed and sized for Eurorack systems. You will need a 16 pin Eurorack 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 3080-VCO

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 R30 HF Trim 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: Adjust R1 Offset until the frequency is 16.35Hz.

6. Connect a CV source such (as a keyboard controller CV) into the 1V/octave jack.

Table of Contents

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Page 1 3080 VCO v1.2 – User Guide This is the setup and user guide. The unit is designed for a monophonic Analog synthesizer. The module is designed and sized for Eurorack systems. You will need a 16 pin Eurorack 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.
Page 2 7. VOLTS/OCTAVE adjustment: Repeatedly pay two notes one octave apart at the low end (say C2 65.4 Hz and C3 130.8 Hz) and adjust R20 V/Oct until the frequency of the high note is exactly double that of the low note. Check the frequency of other notes separated by one octave. Fine tune R20 until the best tracking is obtained.