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|6th May 2009, 02:36 PM||#1|
On the proper way to power a firewire device
I have just bought an apogee duet for my laptop. The problem is that it has a mini-firewire instead of a normal, powered bus.
Now i'm drawing the power from my charger in that way:
DA0 => DA0
DA1 => DA1
DB0 => DB0
DB1 => DB1
Inner shield => Inner shield
Outer shield => Outer
P+ => AC adapter power
PG => AC adapter ground
I belive this to be fine because the power charger ground is related to data signals by the circuitry at the guts of the laptop, but sice i plan to add an external charger for the duet to allow better mobility and also add some snake oil i will need to relate the power ground to the signal voltages.
Should the power ground be tied to the external shield at the power taking point?
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