How to connect multiple devices using one USB port and a breadboard?

Question

I have an audio device with 8 channels, every 2 of which need to be powered by a 5V power outlet. Up until now, my lab used USB chargers to solve the problem.
But now I have to improve upon it, and I want to make sure I keep to best practices.
Each device powers 2 vibrating actuators with 5V USB cables. Instead of connecting them to a splitter, I'd like to place all 3 power lines on a singular breadboard, and connect them all to a single USB, like so:

 *    *    *    *    *    *    *    *    *    * -   *
 *    *    *    *    *    *    *    *    *    * -   *
 *    *    * D1pwr     D2pwr     D3pwr   *    *    USBPWR
 *    *    * D1gnd     D2gnd     D3gnd   *    *    USBGND
 *    *    *    *    *    *    *    *    *    * -   *

Is this the safe way to connect them all? Or would you have a better idea?

Answer 1

You have 2W x 2 actuators x 8 devices = 32W. The maximum you can reasonably get out of a single USB port at 5V is 15W, most chargers can even only deliver 10W or less. So that's not going to work. Additionally, voltage drop will be significant if you draw that much power out of an ordinary USB cable. Since you apparently only need the 5V power and no data lines, I would suggest to use a lab power supply instead. These can more easily deliver the required current (you need roughly 7A to be on the safe side) and also use adequate cables for that.