I don’t have an original power supply for the SF314. It is very common that this drive today is sold without a power supply. It is possible to use a power supply from some routers, that give +5V and +12V at 0.85A. Here are two of same power supplies with different brands:
The power supply cable needs a female DIN5 connector. The pinout:
Atari ST FDD data cable is a holy grail today due to a very rare DIN14 connector. Here is the original cable:
It is possible to purchase the connectors, for example at Exxos and make the cable at home.