Good morning,
If I power a strip at different positions from the same transformer, do I need to have a cable from the transformer to every position or can I go from transformer to position A, then to position B ?
Cheers
You should use separate wires - or, make sure that you’re using a heavy enough gauge wire to account for voltage drops as well as the total amperage that you’re trying to run through the wire.
@Daniel_Garcia This is how I did this : https://photos.google.com/share/AF1QipNNNqer-ilyt3gdJZwnbvChfuwnBh36vp4VTk9hqK2uGmFgo7XnV0UD0dBbEXl-UA?key=MnNobngxdWg2MVRCdTBUNXdvakc0TzhHbmdUT3FB
If I understand well, you say it’s ok if I use heavy enough wire, I used 0.75mm, 21 gauge I think, for 96 pixels @ 5V, do you think it’s enough, is there some formula I could learn from ?
Also last question, do I need to connect both V+ and ground, or only V+ ?
Thanks a lot for your time
Definitely connect both wires. 21 gauge might be a bit thin though. I used 22 gauge solid core for 48 pixels so you’ll want about twice as thick as whatever thickness that is.
@1icri_Old_Account ok, I’ll find 1.5mm wire and connect both then, thank you for your help 
@Philippe_Maegerman Actually, 0.8mm to 1.0mm (single core) wire is sufficient. That’s about 20 to 18 AWG. Also if you’re looking for a good source of info on this, use http://www.engineeringtoolbox.com/wire-gauges-d_419.html . Other websites report significantly less current per thickness but I can confirm from experience that engineering toolbox can be trusted.