Change 1: Ground on the power connector seems to be isolated
Explanation: Ground pin is not isolated, but is connected to a complete ground shield copper on PCB.
Change 2: Numbering of the transistors on the stencils.
Explanation: Due to a revision 1.1 of this board, T1 and T2 were renamed T4 and T5 (both BC547)
Change 3: The stencils show BC547 whenre the suggested transistor is 2N3904
Explanation: This is upgraded in V1.1 of the board.
Change 4: The noise generator doesn't generate noise
Explanation: Check the position of your BC547 against the silkscreen on your PCB.
If you want to use 2N3904 on V1.1 of the board, don't follow its silkscreen for T4 and T5.Collector and emitter are swapped. Y
ou will have to turn these 180 degrees on your PCB.