I am reading all of the replies - it's possible I missed something, however. If this is the device you meant:
then I don't see it helping my project. My goal is to have one power cord - the 110VAC PC power cord - running from a house outlet to my project box and then convert to any other voltages I need internally. All of the other jacks on the outside of the box are for power output only to various parts of the animatronic I'm building (lights, motor, speaker). I don't want the animatronic to have multiple power cords coming into it. If this design is unrealistic then I'll reconsider, but I don't want to give up on that goal unless I have to. The boxy part of that adapter also just won't physically fit in the project enclosure I'm using if I were to split the 110VAC coming in to go to it. I was hoping for a suggestion of a small converter that I could drop in in place of the LED driver I'm using now.
OK. I did not mean to impugn your knowledge; it's just hard for me, an amateur, to filter the nonsense from the valuable advice.
I can remove the JD-VCC/VCC jumper on my relay module and connect JD-VCC and GND to the output on my converter. I know how to connect the control outputs from the Arduino (A0-A3) to the relay module's IN pins, but can you please clarify how I connect the 5V from the Arduino to VCC on the relay module? Based on the discussion in this thread I was going to have the Arduino's 5V pin connected to the output of the converter to power the Arduino, so where would another wire from the Arduino to the relay module's VCC be connected on the Arduino end?
Thanks once again to everyone for all of the help,
Mike