You may choose a simpler adapter and external PSU to connect your disk to USB. Some people have reported unreliability and even system damage through the use of these though. I use a USB <-> SATA adapter device with a female USB A cable termination, and an ATX psu to power the disk.
You may also choose to use an enclosure for 3.5 disks with built-in SATA/USB interface and usually a 12V PSU with a standard plug connector (not a computer type, molex or SATA). Thus any 12V psu is likely to suffice provided it has sufficient current capacity.
Doh!
6.March.2016