Power Injection question

sck1ng

Apprentice elf
Joined
Oct 23, 2013
Messages
77
I was wondering that if I had a single PSU feeding a string of 200 pixels and had to power inject at the end of the string from the same PSU, do I only need +V connected or should I also connect the GND?
 

nzlongfellow

Dennis from NZ
Joined
Jan 2, 2014
Messages
538
Location
Lepperton, Taranaki
sck1ng said:
I was wondering that if I had a single PSU feeding a string of 200 pixels and had to power inject at the end of the string from the same PSU, do I only need +V connected or should I also connect the GND?

You need to connect both the +ve and Gnd at each end.
 

mborg10

Michael Borg
Joined
Dec 28, 2011
Messages
1,446
Location
claremont meadows
That's right you need +ve and ground to complete the circuit, if easier you could inject in the middle at 100 pixels for same result
 

Maple

New elf
Joined
Nov 30, 2012
Messages
10
Location
Victoria
Im looking at something similar and wondering if this is correct:


6 arches, each with 75 pixels.
Each set of 2 arches will be off a single output of a pixlite, e.g. output x (power and data) to Arch y (y=1, 3 or 5). I need to feed power back in to the ends of each set of 2 (arch 2, 4 and 6). Can I just run a separate feed of + and - for each of these 3 from the same supply as powering the pixlite?

[edit: previous was not entirely clear (or correct - it has been a while since I've put these together.)]
 
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