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#1  
you need to connect all grounds to a same point
United Kingdom
#2  
That's slightly misleading. You need to tie all grounds together, you don't necessarily need to connect them at the same point.

What I did was cut in to the supply to the EZB, fitted a 6V regulator, made up a board for +6V and Ground. Then had the white to the EZB and the red & black to the 6V board.
#3  
Thanks.

If I connect 2 ground wires together (in a Y shape), and send one end to the servo, one end to the external 6V power supply and one end to the EZ-b, will that do the trick?

Frank
United Kingdom
#4  
Is the External 6V power also supplying the EZB? If it is you needn't send it back there.

I think you can just link the grounds of all supplies together, so a short jumper from batter 1 ground to battery 2 ground (await confirmation, I'm not completely sure on that).
#5  
@Kudo its called common ground . if ezb and servos are powered by the same 6v source they have common ground and a separate ground wire is not needed. You would only need a ground wire if the power source feeding ezb was separate from the power source for a motor/servo which is called uncommon ground and a separate ground wire connection would be needed.;)
United Kingdom
#6  
@Josh, can you just connect the 2 grounds of the batteries together? Really unsure on that one as I've not had to do it.
#7  
Yes you could connect the grounds together. It just cannot feed pos from ezb.... It needs to be direct to power source because ezb regulators have limitations.
#8  
My setup would be a 12V battery going to a power distribution board. 9V from that board goes to the EZ-b and 6V from that board to the servo. So indirectly, the same battery is powering both the EZ-b and servo. In this case, is one ground going to the 6V part of the power distribution board sufficient?

thanks again,

Frank
#9  
Why are you doing the 9 volt at all? Do you have something that can only use 9? I would just have a 6 volt battery run everything unless you need 12v for more power to drive motors. In that case use a 12v battery and a 6 volt BEC for the servos. Electrically varied + positive voltages can share a common - ground but you also want to keep your system as simple as possible.
#10  
Thanks. There are a couple things that need 12 volts in my setup, a couple that need USB power, some lights that work best at 9V, different power demands of the 2 types of servos-- an unfortunate mix, which the power distribution board helps with.

It sounds like the one ground will work, if I'm interpreting things correctly.

Frank
#11  
One ground will. What I suggest is having one power source. 12v then to get 6v use a 6v bec for the your servos and you can use a buck step down adjustable converter to get your regulated 9 volts. Its cheap... Easy and only one battery. Both the BEC and step down converter are found for a few dollars on eBay;) - Josh S
#12  
Thanks, Josh!

Frank