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Personal Circuits Midi-CV-Autotune Assembly Manual

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Midi-CV-Autotune v1.4 – 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-Autotune 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 16

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Summary of Contents for Personal Circuits Midi-CV-Autotune

  • Page 1 Follow the parts lists, these instructions and the PCB silkscreen text to build the module. The Midi-CV-Autotune 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 Autotune-Gates) 1. Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. Page 2 of 16...
  • Page 3 2. 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. 3. 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.
  • Page 4 4. Power socket Install the 16-pin power socket on the TOP of the board. The socket should face OUT from the board. Solder. 5. 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 5 For type B, ensure the jumpers do not touch each other when they cross. 6. 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. See photos. Solder. 7.
  • Page 6 8. Tantalum capacitors Install these on the TOP. Make sure you orient these capacitors correctly. The longer lead and/or the lead marked with a + needs to be inserted into the hole that has the “+” marking near it. Leads marked with “-“ go in the board hole WITHOUT the “+”. Solder and clip the leads. 9.
  • Page 7 10. Electrolytic capacitors Install these on the TOP. Make sure you orient these capacitors correctly. The longer lead and/or the lead marked with a + needs to be inserted into the hole that has the “+” marking near it. Leads marked with “-“ go in the board hole WITHOUT the “+”. Solder and clip the leads. 11.
  • Page 8 12. USB sockets The B Type (Square) is installed first. This is installed on the BOTTOM of the board. After soldering, cut all pins flush so they will not touch parts that will be installed after them. Then install the A Type socket (Rectangular). This is installed on the TOP. Squeeze the frame clips on each side together slightly so that it fits in the holes.
  • Page 9 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. You can test the fit using the front panel as a guide.
  • Page 10 Constructing the CV board (labeled Autotune-CV) 1. Resistors Install the flat resistors on the TOP of the board. Solder and clip the leads. 15. 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.
  • Page 11 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. Solder. 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.
  • Page 12 4. Ceramic/film capacitors Install the ceramic/film capacitors on the TOP of the board. Solder and clip the leads. 5. Trimmer resistors a. Use a multimeter to set these to approx 5k between pin 1 and 2. Use a trimmer adjustment tool. Page 12 of 16...
  • Page 13 b. Now populate the trimmer pots on the PCB. 6. 3.5mm Jack Sockets Install the jacks on the top and solder. Cut the pins flush with the PCB. 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 14: 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 15 a. At IC4, IC5: pins 4,6,8,10 approx = 1.58V b. At IC4, IC5 pins 12 = 0V c. At IC4, IC5 pins 3 approx = +5 V d. IC4: pins13,14 approx = +10.5 V e. IC5: pins 1,2,13,14 approx = +3.3 V At IC1: pins 6 approx = +10.5 V g.

  • Page 16: Final Assembly

    6. TIP: If there are no shorts, missing components or unsoldered joints, the most likely cause for a voltage discrepancy is one or more resistors in the wrong place. You will need to check the value of each resistor against the BOM and the layouts shown in the photos of the unpopulated boards.