I am creating a LED lighting unit for an Aquarium and I have a 240vAC to 24v DC power supply.
I want to output 12V and 5V also in addition to the 24v DC.
I have 2 buck modules - like these http://www.ebay.com/itm/1Pcs-Lm2596-Power-Supply-Output-1-23V-30V-Dc-Dc-Buck-Converter-Step-Down-Modul-A-/301988858332?hash=item464ff049dc:g:5MgAAOSwYmZXEehH off ebay set to 5v and 12v from the 24v input.
Measuring the DC on the output side I get the correct voltage from the output + and - connections.
My question is in my project I have a need for a lot of 5v and GND connections.
Can I just join all the GNDs together?
Will this work or is this a stupid thing to do? What would happen?
The 12v device is an Arduino and the 5v device will be connected to the arduino pins.