Hi,

With B2 revision, there is no provision for powering down expansion board s(ADC/DAC etc.), which is pity. For B3 revision I've designed simple high side switch. Before I close the pcb design, I just wanted to test the switch, so I lets have some test-boards:

Second board is new and better power sequencing - resetting diodes and some minor tweaks.

Also we will have a AMA on 13.06. So if you feel like, please stop by!