Most Eurorack modules have adopted a standard 10-pin power input, with two -12V pins on one end and two +12V pins on the other. The center six pins are connected to ground. The -12V side is usually marked by a line on the PCB silkscreen and corresponds with the red stripe on the power cable. This is the pinout replicated in this project. Always check the pinouts and specifications of your gear before plugging them into new power supplies.

A toggle switch is connected to the EN (enable) pin on the TPS65131 breakout and lets you turn the power supply on or off. The lid for the 3D printed enclosure has an embossed line to denote the -12V rail on the 2x5 pin header.

The mounting plate has holes for all of the components.

The lid has cutouts for the USB C port, switch and IDC power cable. There is an embossed notch to the left of the power cable slot to denote the -12V rail.

Solder a wire from USB VBUS to boost Vin (red wire). Solder a second wire from USB GND to boost GND (white wire).

Solder the 2x5 header to the perma-proto board. The first row should be on row 2; one row away from the mounting hole.

Solder a wire from the boost V+ to the top power (+) rail on the perma-proto (yellow wire). This will be the +12VDC rail.

Solder a wire from the boost GND to the top ground (-) rail on the perma-proto (white wire).

Solder a wire from the boost V- to the bottom power (+) rail on the perma-proto (green wire). This will be the -12VDC rail.

Solder a wire from the boost GND to the bottom ground (-) rail on the perma-proto (white wire).

Solder a small wire from the bottom negative power rail to the first row on the header (green wire).

Solder three small wires from the bottom ground rail to the second, third and fourth rows on the header (white wires).

Solder a short wire to connect pins 1 and 2 on the header to the negative voltage line (green wire).

Solder three small wires from the top ground rail to the second, third and fourth rows on the header (white wires).

Solder a small wire from the top positive power rail to the last row on the header (yellow wire).

Solder a short wire to connect pins 9 and 10 on the header to the positive voltage line (yellow wire).

Solder a wire from the EN pin on the boost to the closest row on the perma-proto (blue wire).

Solder a wire from the EN row to the other side of the perma-proto board (blue wire).

Solder a wire from the middle pin on the toggle switch to the EN row (blue wire). Solder a wire from the bottom pin on the toggle switch to the bottom GND row (white wire).

That completes the wiring!

You'll turn the positive voltage trim pot, located on the left side of the board, with a smaller screwdriver to dial in the correct positive voltage output.

Set your multimeter to DC voltage mode. Connect the ground probe to one of the ground pins on the header. Connect the volts probe to one of the positive voltage pins on the header. Use a small screwdriver to turn the positive voltage trim pot on the left side of the breakout to dial in +12V.

You'll turn the negative voltage trim pot, located on the right side of the board, with a smaller screwdriver to dial in the correct negative voltage output.

Set your multimeter to DC voltage mode. Connect the ground probe to one of the ground pins on the header. Connect the volts probe to one of the negative voltage pins on the header. Use a small screwdriver to turn the negative voltage trim pot on the right side of the breakout to dial in -12V.

Attach the USB breakout to the mount with four M2.5 screws and nuts.

Turn the mount over. Attach the right mounting hole of the boost breakout to the center mounting hole of the mount with an M2.5 screw and nut.

Flip the mount back upright. Attach the perma proto board to the two remaining mounting holes with M2.5 screws and nuts. The second mounting hole for the boost breakout should be secured with the screw closest to the USB breakout.

Now would be a great time to double check that your voltage readings on the breakout are still accurate before closing up the enclosure. You should read -12V on the negative rail and +12V on the positive rail.

If you skipped the Tune to +12V and -12V page, please go back to it.

Insert the assembled mounting plate into the enclosure box. The screws will notch into the mounts in the bottom of the box. Attach the toggle switch to the opening in the lid.

Close up the box with the lid. You'll notice an embossed line to the left of the negative rail on the 2x5 header. This denotes the negative rail for Eurorack module. Now you're ready to use the power supply.

Eurorack IDC power cables usually have a red stripe on one side that denotes the -12V rail.

There are also IDC connector adapters for gear that don't use standard power connections. This adapter converts Teenage Engineering Pocket Operator Modular 3-pin connectors to a Eurorack power connector.

Plug your IDC power cable into the power supply, making sure that the -12V lines are matched. There an embossed line on the 3D printed lid to help as a reminder for the -12V location.

Connect a 5V USB power supply to the USB C plug. The TPS65131 accepts 3 to 5.5V as an input voltage, so any 5V USB power supply will work. Switch on the power supply and you're ready to use your module.