How is a Butterfly Labs Bitforce Single powered? Its website says it uses 80W of power, so that's too much for a USB port. How does it receive it's power?
Can it run on a 240V power supply, or does it need 110V?
Note I'm not asking about the newer &quot;Bitforce Single (SC)&quot;, which hasn't been shipped to anyone yet. This the older (FPGA?) hardware that has been sold for some time.
It uses ~70W @ 12V of external power. The stock power brick is cheaply made, giant, and inefficient (PF=.5,efficiency~.8). Fortunately, the power brick can run on 240V.  Many people make their own cables to use an ATX or bench PSU (with higher powerfactor and efficiency)

source: https://bitcointalk.org/index.php?topic=67819.msg796852#msg796852