PMFoundations 3080 VCO

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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.

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PMFoundations 3080 VCO Specifications

General

Details the module's design for Eurorack systems and lists necessary components and tools for setup.

Prepare the unit by setting HF Trim, disconnecting CV, centering controls, and connecting a frequency counter.

Adjust R1 Offset to set the initial frequency to 16.35Hz.

Adjust R20 V/Oct to ensure accurate pitch tracking across octaves.

Adjust R30 HF trim to maintain accurate pitch tracking at higher frequencies.

Adjust R19 Sine Symmetry and R2 Sine Round for optimal sine wave output.