Power question

[Dave_Szoka]

so I have just built my new controller box for my roof bits..
Because this year I’m adding 2x 46” singing bulbs to my roof I have had to add another power supply.

The question is: I want to just use port 4 of my differential receiver for data only.. no power

As you can see I have wired the 12v into a distro board... should I also do the negative(ground)

I hope that makes sense

 

[AAH]

Any chance of a picture of what you want to do. I can't picture what you're trying to do and I couldn't work it out from the photo.

 

[Dave_Szoka]

Basically
Power supply 1 is power the differential receiver board

Power supply 2 is for the power inject

Ports 1 though 3 are for my roof line all running of supply 1

Port 4 is for 2x 46” singing bulbs.. in the photo above I have attached the 12v to supply 2 and left the data & ground going into the differential receiver..

Do I need to connect the ground to supply 2as well

 

[ezellner]

Grounds between power supplies should be connected to make the ground reference is common otherwise there is the potential for the ground planes to be different causing unintended consequences,

 

[Nuzzy]

So if I understand correctly, your power supply 1 runs your differential board and powers your existing roof bits through that board. The distro board is only for your new power supply and you want to take the data out of port 4 on the differential board to run the new elements.

If so then you have to have the grounds of the power supplies tied together and make sure the power wire in port 4 is not connected and it should work no worries.