PCB 21

[cutty]

Thanks Cutty for clarifying the ongoing Blue documentation.

I can see how paragraph 2.3 could lead to confusion, and a very good question, Good catch, MonkeeRench. 
 
2.3 Voltage regulator extension

Unfortunately, the voltage regulators of the boards PCB 19.1 and PCB 19.2 are not adequately adapted to the current consumptions of the boards. This problem is eliminated by the piggyback board PCB 21.
etc....