X-7

X-7 series mark IV - The Copper Plate DAC | resources

(We came in 11th in HiFiBerry and Bang & Olufsen's CREATE Maker Contest)

This series of players we built around a copper plate that is used as a "star ground" and the heat sink for all linear power regulators. Two aluminium casing plates complete the unit. A lower base holds the transformer, mains connector and the circuit. The top one is the cover.

This is our "form follows function follows finance..." design statement.

Overview

Parts

For the metal plates (aluminum & copper) please have a look at the SketchUp model and the PDF file below.

1x Mains Hookup "Kabel-Kaltgerätestecker K+B"

1x Noratel 80VA 2x 9V transformer (closed design looks a little bit safer)

1x 4 pin PSU connector (ATX P4 connector)

1x 6A Schottky diode

1x Panasonic 5600uF/35V

1x 2.2 ohm 7W resistor

1x Kendeil 10000uF/40V (look on ebay)

1x Panasonic 5600uF/35V

2x single LM317 reg set to 5V (cpu & usb)

2x single LM317 reg set to 3V3 (DVDD & CLOCKS) - the second with a VBE filter

1x 3V3 SuperTeddyReg

1x Hifiberry's DAC+ PRO

1x Raspberry Pi Mod B+...

Hookup wire

Useful information

PSU knowledge you will find here.

Circuit layouts you will find here. 

Aluminium and Copper Plates

The plates are lasercut by Gottschalk Metallbearbeitung.

First the copper plate gets 2mm tubes soldered in (please have a look at the images linked below) to make a soldering connection possible,

then we drill the threads where the regulators will be mounted.

Circuit Assembly

The PCB free regulator design allows you to simply bend together all parts of a circuit, fix it with a a few "drops" of solder, add them to the copper plate and hook them up with their units. 

LM317 Regulator

VBE Filter 

Here are some additional pictures of the assembly process.