Based on an idea of a German company called Siemens & Halske I build a music player of different kind. The basic idea of Siemens was, to build a modular radio system where the customer was able to buy one component after each other.
The original radio system was build 1924 and it has three bus systems.
Power bus
HF bus
Audio bus
I adapted this idea and build a modular Volumio player.
In the middle the main component
Raspberry with touch display
128 GByte Memory
Display Plugin
GPIO Plugin
Right hand side from the main unit the DAC with VU - meters
Left hand side from the main unit a measurement unit for the main voltages
And two active speakers 35 W class D
The D-Train Volumio player has three bus systems as well:
USB - BUS
Power BUS (+5, +12, +24)
Audio Bus
All connected on the front by the copper bridges.
Detailed photos can be found at http://salon.clockworker.de/forum/topics/ein-d-zug-oder-ein-etwas-anderer-mp3-spieler
Have Fun everybody