Hello all list members,
I'm gonna try to explain how your USB ports work.
And in the process of this, I'm also try to put away allot of misconceptions
and myths about it.
In 1986, the USB port was developed to transmit and receive digital information
or if you will, data from the computer to other digital devices such as,
printers scanners and fax machines.
All of these devices usually have their own power supplies.
Even though, 1.5 volts is needed to open up the data ports that are built in to
the devices, the devices themselves, aren't powered by the USB ports.
These days, the USB ports are used to open up the data ports on memory chips
that are built in to storage devices such as, thumb drives external hard drives
and MP3 players and IPods.
As I said in an earlier post, your lab top and desk top computers have 12 volt
power supplies powering them.
In some electronic equipment, there are power/currant limiting resisters to
reduce the voltage to what the engineer desires.
But inside your computers, there is a chip that does a triple job.
This chip cuts the high voltage down to what the storage devices can handle
which is, 1.5 volts in to 135 MA.
This chip also handles the transmitting and the receiving of data.
This is why we're able to transfer audio/video files to our MP3 players and
IPods.
The same thing is also true about transferring pictures from digital cameras to
our computers.
The USB port was never mint to power devices alone.
But in order to make the USB port a viable power supply, a couple of changes
will have to be made.
First, the voltage will have to be razed from 1.5 volts to pretty close to what
the computers power supply is delivering.
Next, the currant will have to be razed from 135 MA to about 1500 MA.
But if we do this, the storage devices will overload and burn out.
unless, you increase their capacity too as well.
I hope I clarified the way your USB ports work.
My best regards.
John.
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