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Personal Circuits Midi-CV-8 Assembly Manual

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Midi-CV-8 v1.3 – 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 and +5V which is connected to a synth power supply.
Follow the parts lists, these instructions and the PCB silkscreen text to build the module.
The Midi-CV-8 consists of two PCB boards 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 must follow the order of assembly as described below since some components will be soldered
underneath other components.
Page 1 of 15

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Summary of Contents for Personal Circuits Midi-CV-8

  • Page 1 Follow the parts lists, these instructions and the PCB silkscreen text to build the module. The Midi-CV-8 consists of two PCB boards 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.
  • Page 2 Constructing the Gates board (labeled Midi-Seq-Gates) 1. Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. 2. Jumpers The TRS jack can be configured to operate as a DIN-TRS Type A jack (MIDI Standard) or as a Type B jack.
  • Page 3 3. Diodes Install the diodes on the TOP of the board. These are polarized components. Align the stripe on each diode with the stripe marked on the board. Solder and clip the leads. Page 3 of 15...
  • Page 4 4. 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. 5. Power socket Install the 16-pin power socket on the TOP of the board. The socket should face OUT from the board.
  • Page 5 6. 5 pin male headers These should be installed on the BOTTOM of the board and soldered on the TOP. Solder these connectors at 90 DEGREES to the board as close as possible. The short part of each pin goes into the board and the longer part sticks out from the board.
  • Page 6 8. LED Install the LED on the BOTTOM. Cut the pins flush after soldering so they do not interfere with parts that will be installed over them. Page 6 of 15...
  • Page 7 9. Ceramic/film capacitors Install the ceramic/film capacitors on the TOP of the board. Solder and clip the leads. 10. ICSP connector Install the 6-pin ICSP connector on TOP. Orient so the long pins face out pins and the short pins go into the board.
  • Page 8 12. Voltage regulator Install the Voltage regulator U4 on the TOP of the board. This is a polarized component. Align the outline with the outline on the board. Solder and clip the leads. 13. 3.5mm Jack Sockets Install the jacks on the top and the bottom. Solder each jack, one at a time ensuring that it is flat against the board, upright, and aligned with the edge of the board.
  • Page 9 Page 9 of 15...
  • Page 10 Constructing the CV board (labeled Midi-Seq-CV) 1. Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. 2. IC Sockets Install the IC 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.
  • Page 11 3. Female 5 pin connectors These should be installed on the BOTTOM of the board and soldered on the TOP. Solder these connectors at 90 DEGREES to the board as close as possible. It is very important that these items are installed on the BOTTOM! 4.
  • Page 12 b. Now populate the trimmer pots on the PCB. 6. 3.5mm Jack Sockets Install the jacks on the top and solder. Alignment 1. Join the two PCBs by aligning the 5 pin headers on the “Gates” board with the 5 pin female headers on the CV board and press together carefully.

  • Page 13: Voltage Tests

    2. Do not install the ICs until the voltage tests are complete. 3. If you do not trust all your soldering and connections, carry out the voltage tests below before connecting an Android device or installing the ICs Voltage tests 1.

  • Page 14: Final Assembly

    e. At IC5: pins 2 approx = 0 V At IC5: pins 1 = +1.8 V g. At IC4, IC5, IC6: pin 12 = 0V h. At IC3 pin 16 Approx = +3.3V At IC3 all other pins = 0V At IC2 pins 1,13,23,25, 28 approx = 3.3V k.
  • Page 15 3. Put nuts on the jacks. 4. NOW READ THE USER GUIDE. Page 15 of 15...