Must I supply power to FireWire card if units plugged into it already have power?

[jackoloki]

I'm currently in the hunt for a FireWire Card so I'll be able to do pro-audio on a HP 4530s (A7K07UT)

I've read on this site that you need to add a power supply, but I'll be using it with an audio interface (TC Electronics Impact Twin) and a hard drive (WD MyBook) that both already have their own power supplies. I shouldn't need to supply additional power, right? Or do I need an additional power supply to power the actual card?​

Thanks,
Rob

 

[powerpcg5]

No, the onboard power of your connected device will power the unit. FW will just be data.

 

[jackoloki]

Thanks. Somebody said they had to get an expensive AC adapter to power their audio interface... mustn't have had it's own power supply... one less thing to have to worry about.