8
Audial USB board
Mk2
Fig 3: Recommended rear panel cut-out, rear view (all measures in mm)
LED INDICATORS
The board offers connections for three indicating LE
diodes. D1
0
indicates the
board power supply
(
it is
connected to
R5-R6/C4, fed by AC
2
), D101 indicates
the USB
cable connection
(it is connected to USB
Vbus)
, while D102 indicates the audio stream i.e.
playback (flag comes from decoding processor).
BOARD SIZE AND MOUNTING
The board size is 110 mm (width) x 120 mm (depth).
There are four mounting holes, each 4 mm in diameter,
located 5 mm from the board back, left and front
edge, and 25 mm from the right edge.
Center of USB connector is 27 mm from left edge of
the board. Center of S/PDIF output BNC connector
(applies to boards with S/PDIF output) is 67 mm from
the left edge of the board.
To determine heights of the holes at the back plate
required for these connectors, please consider not
only PCB stand-offs, but also PCB itself, which is 1.6
mm thick. The drawing below shows recommended
BNC and USB connectors panel cut-out (rear view),
taking into account 15 mm stand-offs at that.
