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PMFoundations 6080 VCO Assembly Manual

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6080 VCO V1.2 – Assembly Guide
Thank you for purchasing this module! This is an average build with tightly packed components
and some precision integrated circuits. Some of the pads are quite small and you will need a
chisel tip or screwdriver tip soldering iron and the skill to solder these tiny joints.
The module is designed and sized for Eurorack systems. You will need a 16-10 pin eurorack
power ribbon connector with –12/0/+12 which is connected to a synth power supply.
Alternatively you can build to your own specification using the PCBs and solder wires from the
switches, pots, LEDs and jack footprints to your desired front panels.
Follow the parts lists, these instructions and the PCB silkscreen text to build the module.
The module consists of 2 PCB boards and a panel.
There are components installed on BOTH sides of the boards. Please ensure that you place
the components on the correct side. When referring to the TOP of a board we mean the side
with the pmF logo. The BOTTOM has no logo.
You must follow the order of assembly as described below since some components will be
soldered underneath other components.

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Summary of Contents for PMFoundations 6080 VCO

  • Page 1 6080 VCO V1.2 – Assembly Guide Thank you for purchasing this module! This is an average build with tightly packed components and some precision integrated circuits. Some of the pads are quite small and you will need a chisel tip or screwdriver tip soldering iron and the skill to solder these tiny joints.
  • Page 2 Constructing the Main board (labeled 6080-VCO-Main V1.x) Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. Diodes (but not LEDs) Install the diodes on the TOP of the board. Align the stripe on each diode with the stripe marked on the board.

  • Page 3: Power Socket

    IC Sockets Install the sockets on the TOP of the board. Observe the notch or mark on the socket and align with the notch or mark on the board. Solder. Power socket Install the 10 pin power socket on the TOP of the board. ​ T his must be installed with the correct orientation or the module will be damaged when the power is connected.
  • Page 4 Bipolar Transistors Install the transistors on the TOP of the board. Do not mix up the NPNs(marked T) with the PNPs(marked Q). These are polarized components. Align the outline with the outline on the board. They should be raised off the board surface slightly and at the same height. Solder and clip the leads.

  • Page 5: Electrolytic Capacitors

    Thermistor Install the thermistor on the TOP of the board. It should be raised off the board surface slightly and at the same height as the adjacent transistors. Try and move the two transistors and the thermistor close together and tie them together with a small zip tie or with epoxy. Solder and clip the leads.
  • Page 6 Trimmer resistors Populate the trimmer pots on the PCB. Make sure the multi turn trimmers are oriented so that the screw is above the circle on the silk screen. Potentiometers If the pots have positioning lugs on the front, cut these off with a sharp pair of flush cutting pliers.
  • Page 7 Carefully align the pots so they are flush with the edge of the board and perfectly upright and tight to the board surface. They are on both sides. The easiest order for installation is 1,4,3,2. Please ensure they are on the CORRECT SIDE OF THE BOARD. See Photo. 3.5mm Jack Sockets Install the jacks on the TOP and fully solder each one as you install it.
  • Page 8 Bend the leads as shown in the photo. The bend id at ⅜” = 9mm from the base of the LED. Insert in the board with the long lead in the hole marked + and use the panel to align the LEDs. The correct location for the panel is with the pots emerging from the holes marked: Fine, LIN FM, PW, PWM and the jacks emerging from the output waveform markings.
  • Page 9 You can also use different headers.​ You can install 517-929974-01-05-RK or 517-929850-01-05-RA female headers on this board and 517-929834-02-05-RK on the Saw Shaper board. Solder the female headers first, then insert the male headers into the female headers, then,when you join the boards, you can solder the pins on the Saw board and then the two boards can be separated easily.
  • Page 10 Constructing the Saw Shaper board (labeled 6080-Saw-1x) Flat Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. IC Sockets Install the IC socket on the TOP of the board. Observe the notch or mark on the socket and align with the notch or mark on the board.
  • Page 11 FETs Select SMD OR through hole transistors. The board has footprints for both packages. DO NOT INSTALL both SMD transistors and through hole transistors. Install the transistors on the TOP of the board. These are polarized components. Align the outline with the outline on the board. Solder (and clip the leads if using through hole components.
  • Page 12 Ceramic/film capacitor Install the ceramic/film capacitor on the TOP of the board. Solder and clip the leads. Trimmer resistors Populate the trimmer pots on the PCB. Do not mix up the 2K and the 100K trimmers. Make sure the multi turn trimmers are oriented so that the screw is above the circle on the silk screen.
  • Page 13 Potentiometers If the pots have positioning lugs on the front, cut these off with a sharp pair of flush cutting pliers. The front of the pot (where the shaft protrudes) needs to be flat. Carefully align the pots so they are flush with the edge of the board and perfectly upright and tight to the board surface.
  • Page 14 Sync Resistor If your board is marked V1.0, install the sync resistor R31 across the sync jack (JP3) as shown. ONLY FOR BOARDS MARKED V1.0 (IGNORE OTHERWISE)
  • Page 15 Join Join the two PCBs by aligning the 5 pin headers on the “Main” board with the holes on the Saw Shaper board. Place the front panel over the boards so that the jacks, pot, and LED align with the holes in the panel. ​ P ut nuts on the jacks and pot.and attaching the front panel so that the ​...

  • Page 16: Voltage Tests

    Voltage tests You do not have to do these tests if you are completely happy with your soldering and are sure there are no bridges or incorrectly placed components. However, these tests will ensure that the correct power supplies are sent to the IC pins to ensure they will not be damaged on power Connect the power of the Main board.

  • Page 17: Final Assembly

    If any of these tests fail to match the readings given, you should check the components and soldering before progressing. Final Assembly Place the ICs in place by aligning the notch with the notch graphic on the PCB Silk Screen and notch on the socket. Place the front panel over the PCB so that the pots, jacks and LEDs align with the holes in the panel.