A couple of months ago I bought a new BoB to replace the fried one originally from MD. The original has been discontinued, so I can't get a plug-in replacement. This is the one I bought http://www.ebay.co.uk/itm/Cnc-Router.../261633467531?
The doubt that I have is that I intend to connect it to the drivers in common anode mode, but the 5v for this is derived directly from the USB connection (from my computer). I would have expected this 5v to be solely to drive the opto isolators on the PC side. The stepper drivers being given 5v derived from the 12-24v input to the board.

I am a bit wary of putting 5v directly from the computer to the drivers (Tonman PD2064M).

I would welcome advice on this as my confidence has been lowered when I found the direct connection.

My machine has been out of action now for months and, due to illness, I haven't had the mental energy to put it back together.

Cheers Mates,

Rob