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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