MOTU UltraLite User's Guide download pdf (Page 19)

INSTALLING THE ULTRALITE HARDWARE

connection to the power supply harness inside

your computer. This is the same power supply

harness to which you connect internal hard drives,

CD/DVD drives, etc.

■ PCMCIA slot adapters — If you plan to connect

the UltraLite to a PC card FireWire adapter

(inserted in the PC card slot in your laptop), it

must provide a 6-pin connection and it must also

have its own power supply. Most commonly, these

types of products have a DC power adapter. As you

can see, however, this situation does not allow for

remote battery operation, as the PC card adapter

requires AC.

Examples of bus- powered operation

Here are a few typical examples of bus-powered

UltraLite operation:

Bus power from a desktop computer

Yo u r de s k t o p co m p uter is running off of its usual

AC power connection, and the UltraLite draws

power from the FireWire cable connected to the

computer. There are no limits to running time.

Bus power from an AC-powered laptop

This scenario is identical to the desktop situation

described above: the laptop is powered by AC, the

UltraLite is powered via the FireWire bus and there

are no limits to running time.

Bus power from a battery-powered laptop

The laptop is being powered by its own battery, and

the UltraLite is being powered by its FireWire

connection to the computer. So the laptop battery

is supplying power to both the laptop and the

UltraLite. This is the most compact and portable

operating scenario. Running time is determined by

the capacity of the laptop battery. For extended

recording sessions, bring extra, fully charged

laptop batteries.

DC power supply

If you do not want the UltraLite to draw power

from the computer, and AC power is available, you

can power the UltraLite from any standard

8-18 volt, 12 watt DC power supply with any

polarity (tip positive or negative), and amperage as

shown below.

Bus power versus DC power

When you connect a DC power supply, the

UltraLite could draw power from either FireWire

or the DC power supply. So which source does it

use? The answer is: the source that is currently

supplying the greatest voltage. But in practice, it

doesn’t really matter because the only situation in

which you need to be concerned about the

UltraLite’s power draw is when you are operating it

with a battery-powered laptop. And in this

situation, the only available power is from

FireWire. In all other situations, the computer has

its own power, so it doesn’t matter if the UltraLite is

drawing power from FireWire or not.

Turning off the UltraLite

To t u r n on the UltraLite, push the MAIN VOL

knob. To turn it off, push and hold the MAIN VOL

knob. When the UltraLite is turned off, it is really

in a sort of “sleep” mode, where it still draws just

enough power to detect the power switch (a digital

encoder) when the UltraLite is turned back on. But

the amount of power that the UltraLite draws when

it is turned off is so small that it has very little

practical impact. If you are running a laptop under

battery power, and you are in a situation where you

are not using the UltraLite and you need every last

bit of laptop battery power, unplug the UltraLite

entirely from the computer.

Voltage Amperage

9 volts 1.33 amps

12 volts 1 amp

18 volts 0.66 amps

!UltraLite Manual/Mac Page 19 Monday, September 12, 2005 6:52 PM

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MOTU UltraLite User's Guide Page 19

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