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08-08-2007, 01:53 PM
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#16
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Well with USB standards giving each port a max of 500mA. For each device plugged into that port, you're dropping the available power.
Code:
[] - 500ma (1)
L___[] - 500ma (2)
L___[] - 500ma (3)
That's how power is supplied. Now if I plug a device into hub 2 that pulls 200mA, it leaves 300mA for the other 2 ports, because port 1 can not (not supposed to) exceed 500mA. So if you plug into 3 that requires 400mA... something is going to be hurting.
My module supplies(makes available) a total of 1500mA. Making it perfect for power hungry devices, even more than one  . The other thing is my modules can be set to be always powered on, for items like cell phones, or gps pucks that you would like to keep on...
Cheers 
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08-08-2007, 02:00 PM
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#17
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Low Bitrate
Join Date: Mar 2006
Location: The Hague, the Netherlands
Posts: 66
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It would even be better if it would use the host's USB 5v to switch on and off, rather than the car's switched 12v.
This way, your connected devices will still be connected if your car pc shuts down, usually after you turn off ignition. Disconnecting your devices before shutting down may cause havoc.
Pim
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08-08-2007, 02:15 PM
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#18
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Constant Bitrate
Join Date: Feb 2006
Location: B.More, MD
Posts: 136
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Nice, Very nice. Great Job  You think I could pick up one of the data pass-thru modules at the next car meet?
ps: check this link out http://www.aximsite.com/boards/x50-x...-must-see.html
Can you make one of those Steve or teach me how to. LOL?
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08-08-2007, 03:19 PM
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#19
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Quote: Originally Posted by gokee2  Nice, Very nice. Great Job You think I could pick up one of the data pass-thru modules at the next car meet?
Thanks, and sure. I'll try to have a few of each w/ me.
Quote: Originally Posted by gokee2
Dang... I haven't had a chance to look over it much since I'm at work, but it looks pretty sweet
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08-08-2007, 03:23 PM
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#20
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Raw Wave
Join Date: Apr 2000
Location: Surrey, UK
Posts: 2,129
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Quote: Originally Posted by W3bMa5t3r The modules supply 1.5mA of power, USB specs are 500mA per port, so this should do fine.
Quote: Originally Posted by W3bMa5t3r
Quote: Originally Posted by W3bMa5t3r My module supplies(makes available) a total of 1500mA.
Perhaps you could clarify. 1.5mA (which seems unlikely, but you wrote it twice like that), or 1500mA? I doubted it the first time you wrote it, was just plain confused the second time, and the third time it seemed far more reasonable.
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08-08-2007, 03:26 PM
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#21
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Quote: Originally Posted by Rob Withey Perhaps you could clarify. 1.5mA (which seems unlikely, but you wrote it twice like that), or 1500mA? I doubted it the first time you wrote it, was just plain confused the second time, and the third time it seemed far more reasonable.
   
Each module supplies up to 1.5A (1500mA).
1500mA for the one port with data pass through, or 1500mA shared for the two port, no data pass through.
Last edited by W3bMa5t3r; 08-08-2007 at 03:48 PM.
Reason: doh
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08-08-2007, 03:34 PM
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#22
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Raw Wave
Join Date: Apr 2000
Location: Surrey, UK
Posts: 2,129
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Quote: Originally Posted by W3bMa5t3r Each module supplies up to 1.5mA (1500mA).
Still confused. There are 3 orders of magnitude between those two current values.
1.5mA is not the same as 1500mA. 1.5A is the same as 1500mA.
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08-08-2007, 03:48 PM
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#23
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Quote: Originally Posted by Rob Withey Still confused. There are 3 orders of magnitude between those two current values.
1.5mA is not the same as 1500mA. 1.5A is the same as 1500mA.
hmm lol ah gotcha. Sorry... The latter. 1.5A / 1500mA
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08-09-2007, 02:13 PM
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#24
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Maximum Bitrate
Join Date: Jun 2006
Location: Houston, TX
Posts: 783
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do i have to use this if i am using a power usb hub. I have power connected to the hub so it would give enough power to all my device. Only thing i am using it for is my external 2.5 usb hd. Just a simple question.
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08-09-2007, 02:50 PM
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#25
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Quote: Originally Posted by tn6478 do i have to use this if i am using a power usb hub. I have power connected to the hub so it would give enough power to all my device. Only thing i am using it for is my external 2.5 usb hd. Just a simple question.
If the hub is working fine for you, then no.
This is mainly for devices that require more power than what a normal hub can supply.
Usually larger external hard drives, cell phone chargers, etc. OR if choose to use the option of the module, have a device always on.
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08-13-2007, 03:32 PM
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#26
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Constant Bitrate
Join Date: Feb 2006
Location: B.More, MD
Posts: 136
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Hey Steve,
If I connect a non powered usb hub to your data capable usb module, will that usb hub posess the 1.5A power rating to effectively distribute to other connected usb accessories?
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08-14-2007, 06:07 PM
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#27
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Quote: Originally Posted by gokee2 Hey Steve,
If I connect a non powered usb hub to your data capable usb module, will that usb hub posess the 1.5A power rating to effectively distribute to other connected usb accessories?
The module will supply the 1.5A, but it would depend on the circuitry of the non powered hub as to whether or not it would make full use of the power supplied. Most likely yes, but I wouldn't want to promise/guarantee that.
Hope that helps...
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08-14-2007, 06:28 PM
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#28
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Constant Bitrate
Join Date: Feb 2006
Location: B.More, MD
Posts: 136
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Quote: Originally Posted by W3bMa5t3r The module will supply the 1.5A, but it would depend on the circuitry of the non powered hub as to whether or not it would make full use of the power supplied. Most likely yes, but I wouldn't want to promise/guarantee that.
Hope that helps...
I guess I will have to wait till Saturday then.
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03-02-2008, 01:32 AM
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#29
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FLAC
Join Date: Apr 2006
Location: Washington, DC - Alexandria, VA N/W Area - NOVA
Posts: 1,268
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Never did post the updated pics here. I ended up only making (other than for my personal use) the 1 port with data pass-through. Pics below. More info Here.
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06-19-2008, 01:41 AM
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#30
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Maximum Bitrate
Join Date: May 2004
Location: TX
Posts: 478
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Hey guys. Let me resurrect this one...
I want to make sure I got this right.
Say I have a regular ol' USB hub (non powered) that I ran from my trunk pc to my glove box..
Normally, in order to power it for "heavier" devices, I would have to plug in an AC adapter into an inverter and power the hub.
My question is...
with the device from this thread, can I connect it (w3bmaster's device) to the car's power then plug its USB cable into the hub... thus feeding power into the hub?
Therefore eliminating the need to use the hub's AC adapter?
Or am I way off base?
Thanks for the help!
Last edited by MoFo; 06-19-2008 at 03:18 PM.
Reason: typos
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