Yes, when you are on email lists, you do learn something new every day. The
question is are you learning something that is true, or you learning
something that somebody thinks is true?
Gary King
w4...@bellsouth.net
----- Original Message -----
From: "Jörgen Hansson" <hansson.jo...@spray.se>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Monday, June 07, 2010 9:49 AM
Subject: Re: HOW USB PORTS WORK
Hey John!
Wow, that was also something I didn't know, I am learning something new
every day.
thanks for that info.
Regards,
Jörgen Hansson!
Tel +46 703-601296
www.jorgenhansson.com
skype: djtropical4532
----- Original Message -----
From: "DJ DOCTOR P" <djdoct...@att.net>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Monday, June 07, 2010 12:58 PM
Subject: Re: HOW USB PORTS WORK
High George,
Actually, the windows operating system was developed in 1982.
But it didn't gain its foot hold until early 1991.
But the music didn't ketch up to it until 1994 which is, when Microsoft put
out Windows 95.
We've been ripping and burning CD's on our computers since then.
My best regards.
John.
----- Original Message -----
From: "Jörgen Hansson" <hansson.jo...@spray.se>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Sunday, June 06, 2010 9:52 PM
Subject: Re: HOW USB PORTS WORK
Hi there John!
wow! that was the best info I have ever heard of, I didn't know that the USB
port was in use in 1986. I thought that the USB port came out when the
windows systems came out in the 90's, cause the first PC I saw that on was
from 1998
Regards,
Jörgen Hansson!
Tel +46 703-601296
www.jorgenhansson.com
skype: djtropical4532
----- Original Message -----
From: "DJ DOCTOR P" <djdoct...@att.net>
To: "PC audio discussion list. " <pc-audio@pc-audio.org>
Sent: Monday, June 07, 2010 3:33 AM
Subject: HOW USB PORTS WORK
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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