I use a separate 5V bus for my servos turnout controllers. I currently have about about ten installed. I drive my bus with a switching power supply. Jameco probably has the best US prices. I got mine via Alibaba Express. I wound up getting one with considerably higher Amperage rating then you would think because of start up issues. Normally the servos use very little current to run but when first powered on they can draw significantly more to get to the exact position currently commanded. At power up they all did this at the same time. Sensitivity to this issues is likely dependent on the servo driver. I have been using Pololu USB programmable drivers because of versatility. However they did not have an option to delay startup on individual servos. I am using a 5 Ampere supply currently.
The failure to start up properly was pretty catastrophic for me as it led to bent wires at my servos. Since getting a much bigger supply I have had zero problems. It would be interesting to know how the other stuff out there behaves. I am going to try the Swedish Möllehem controllers going forward. The pricing and delivery to the US was excellent, they seem to be well made and they interface to Loconet which are all priorities for me. It will likely be a couple of months before I actually install my first one.
