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PMFoundations 3080 VCO v1.2 Assembly Manual

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3080 VCO v1.2 – Assembly Guide
Thank you for purchasing this module! This is a complicated build with tightly packed components
and precision integrated circuits. It is not recommended for the beginner.
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.
Follow the parts lists, these instructions and the PCB silkscreen text to build the module.
The module consists of 1 PCB board and a front 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 may need to clean up the board edges with wire cutters and/or a file to remove the remains of
the tabs from the fabrication process. This is particularly important for the edges containing the
jacks. These edges will need to mate flush with the front panel.
You must follow the order of assembly as described below since some components will be soldered
underneath other components.
Constructing the board
1. Clean board edges with wire cutters and/or file to remove the manufacturing tabs.
Page 1 of 13

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Summary of Contents for PMFoundations 3080 VCO v1.2

  • Page 1 3080 VCO v1.2 – Assembly Guide Thank you for purchasing this module! This is a complicated build with tightly packed components and precision integrated circuits. It is not recommended for the beginner. 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.
  • Page 2 2. Resistors Install the flat resistors on the TOP of the board. The resistors between IC sockets for IC1 and IC3 are a tight squeeze! Please ensure you can get the sockets in before you solder these three resistors. Solder and clip the leads. 3.
  • Page 3 4. IC Sockets Install the sockets on the TOP of the board. This module uses either a CA3080 (IC2) OR a LM13700 (IC5). If you will only use one or the other, you do not need to install the IC socket for the alternate part.
  • Page 4 5. Power socket Install the 16 pin power socket on the TOP of the board. Some boards have a straight socket and some a right angle socket. The straight socket should be installed with the notch facing outwards. The opening in the right angle socket should face OUT from the board as shown in the photo.
  • Page 5 8. Transistors Install the transistors on the TOP of the board. 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 of 13...
  • Page 6 9. NTC 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 7 11. 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 prtrudes) needs to be flat. Install SOME pots on the top and SOME on the BOTTOM. Tack one pin only with solder. These will be finalized later.
  • Page 8 12. 3.5mm Jack Sockets Install SOME jacks on the top and SOME on the BOTTOM. Tack one pin only with solder. These will be finalized later. Please ensure they are on the CORRECT SIDE OF THE BOARD. See Photo. 13. Alignment 1.
  • Page 9 5. Remove the front panel and solder all the remaining pins on the jacks and pots. 14. LED Bend the pins of the LED as shown in the photo. The bend is at 17mm (11/16") from the underside of the LED. Note the location of the longest lead. Install the LED loosely on the BOTTOM of the board.
  • Page 10 Page 10 of 13...
  • Page 11 15. Do not install the ICs until the voltage tests are complete. 16. If you do not trust all your soldering and connections, carry out the voltage tests below before installing the ICs Page 11 of 13...

  • Page 12: Voltage Tests

    Voltage tests 1. 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 2.
  • Page 13 5. Install the knobs. 6. NOW READ THE USER GUIDE. Page 13 of 13...