Spencer Russell wrote: > On 4/10/07, Robin Gareus <robin@xxxxxxxxxx> wrote: >> Spencer Russell wrote: >> >> > Hrm, this is problematic. I'd just about settled down to the idea of >> > either the Presonus Firepod of the Edirol FA-66, but if there's no way >> > to get them portable power, >> >> you could get or build an adapter. USB-power + 4pin 1394 to 6pin 1394. >> >> > > I thought about that, but according to [1], Firewire supplies 30V! Can > anyone confirm this? USB only provides 5V, so it would take more than > just an adapter to step up the voltage. There are different kind of "power classes" for IEEE-1394. 1394 requires the devices to regulate their own voltage. The minimum voltage is 8V! 9.25V recommended. it can be as high as 30V. and should not exceed a current of 1.5A... - The PCI-firewire in my desktop just forwards the 12 Volts from the ATX power supply.. -> bug someone with a Mac & Voltmeter ;) Many firewire devices will work just fine with +5V - phantom-powered preamps might pose some kind of a problem.. #robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
