Ah, not to worry, no disrespect taken. According to what I've read, mostly at http://en.wikipedia.org/wiki/Universal_Serial_Bus, the USB specification states that 5 V is supplied. There's also between 900 MA and 1500 MA. I don't know why you'd be seeing different results yourself, but just because the specifications call for one thing doesn't mean there isn't a defect in a particular port or some manufacturer doesn't choose to follow the specifications.
-- Christopher chalt...@gmail.com -----Original Message----- From: pc-audio-boun...@pc-audio.org [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of DJ DOCTOR P Sent: Sunday, June 06, 2010 6:07 AM To: PC Audio Discussion List Subject: Re: Power from USB [was "RE: Laptop speakers question"] High Chris, No disrespect man, but I've taken a talking volt meter and plugged it in to one of my USB ports. I had it sat to DC. The kind of reading I got was: 1.5 volts in to 135 MA. I know that the reading I got is correct because, this thing was built to scientific specks. I use it to bias the tubes in my vintage amplifiers when I think they need to be rebiased. My best regards. John. ----- Original Message ----- From: "Christopher Chaltain" <chalt...@gmail.com> To: "'PC Audio Discussion List'" <pc-audio@pc-audio.org> Sent: Sunday, June 06, 2010 1:48 AM Subject: Power from USB [was "RE: Laptop speakers question"] I guess I have a different take on all of this. Contrary to what someone said early in the thread, the USB port was definitely designed to provide power to attached devices. Otherwise, the specification wouldn't have included this in the first place. In Wikipedia's definition of the Universal Serial Bus (USB) at http://en.wikipedia.org/wiki/Universal_Serial_Bus, it says "The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire from which connected USB devices may draw power." Therefore, I don't see anything wrong with devices taking advantage of this and no one should worry about anything bad happening to their PC's or USB attached devices. In fact, Nokia, Samsung, Motorola, Sony Ericsson and LG have all settled on the micro USB port as their standard power port. China and the European Commission (EC) will also soon be requiring cell phones sold to use the USB port for power and charging. Of course, there are devices that pull more power than the USB port can provide. There are also non-standard devices, including a lot of USB decorations, such as lights, fans, cup warmers and so on that don't include the necessary electronics to support the USB specifications. These devices could potentially cause some erratic behavior on your PC. -- Christopher chalt...@gmail.com -----Original Message----- From: pc-audio-boun...@pc-audio.org [mailto:pc-audio-boun...@pc-audio.org] On Behalf Of DJ DOCTOR P Sent: Saturday, June 05, 2010 7:59 PM To: PC Audio Discussion List Subject: Re: Laptop speakers question Hello Bob, Again, I am in agreement with you on that one. I have had two other cell phones before I ended up with the one I have now. I had the LG VX-4650 and the VX-8350. I've also had cables for those phones that would allow you to hook them up to your computer to sink audio files to them. But however, the computer didn't charge the batteries in those phones while they were connected to the computer. My LG VX-8360 is the only phone that will do that. This is why I had to ask both Verizon Wireless and LG about that. I still plug it in to my computer just to sink audio files to it. But just as soon as I'm done with that, I unplug it because it mite burn out a chip in my computer. If the battery in my cell phone runs down, I plug it in to its own charger and charge it up that way rather then using my computer to do that. My best regards. John. ----- Original Message ----- From: "Bob Seed" <bobs...@tbaytel.net> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> Sent: Saturday, June 05, 2010 5:40 PM Subject: Re: Laptop speakers question > John: > Oh yeh I forgot to mention a portable hand massager! Cell phone charger, > well I will give them the benefit of the doubt! More of a convenient thing > I guess! I think that I would much rather use the charger that comes with > the unit! > ----- Original Message ----- > From: "DJ DOCTOR P" <djdoct...@att.net> > To: "PC Audio Discussion List" <pc-audio@pc-audio.org> > Sent: Saturday, June 05, 2010 1:36 PM > Subject: Re: Laptop speakers question > > >> Hello Bob, >> I am in agreement with you on that one. >> But however, I've noticed that when I plug my cell phone in to my >> computer to sink audio files to it via the USB port, it does charge the >> battery in my cell phone. >> I've asked both Verizon Wireless and LG about this. >> They both told me, "that's suppose to happen because of the way the phone >> was designed." >> But like you, I think that is a misuse of the USB ports on our computers. >> My best regards. >> John. >> ----- Original Message ----- >> From: "Bob Seed" <bobs...@tbaytel.net> >> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >> Sent: Saturday, June 05, 2010 1:24 PM >> Subject: Re: Laptop speakers question >> >> >>> John: >>> The problem that we are being confronted with is that people are being >>> told that the uSB port can do just about anything from charging >>> batteries, powering a small light source, and can also be made available >>> to power a small electric cooling fan, and a number of other electronic >>> gadgets. Personally I would use the USB port for its intended use. Just >>> my opinion! >>> ----- Original Message ----- >>> From: "DJ DOCTOR P" <djdoct...@att.net> >>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>> Sent: Saturday, June 05, 2010 12:51 PM >>> Subject: Re: Laptop speakers question >>> >>> >>>> High Bob, >>>> You are correct, it does require allot of power to drive it. >>>> And you can't get that power from a USB port. >>>> Even though your lab top and desk top computers have 12 volte power >>>> supplies in them, your USB ports are only putting out 1.5 volts. >>>> That's not enough juice to power a subwoofer. >>>> For a 10 watt amp, you'll need ad lease 6 to 12 volts to get that kind >>>> of power in to the woofer itself. >>>> This is why there is no such thing as a USB subwoofer. >>>> My best regards. >>>> John. >>>> ----- Original Message ----- >>>> From: "Bob Seed" <bobs...@tbaytel.net> >>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>> Sent: Saturday, June 05, 2010 12:01 PM >>>> Subject: Re: Laptop speakers question >>>> >>>> >>>>> Don't think that you are going to find such an ammonal, as the >>>>> subwoofer requires a lot of power to drive it! >>>>> ,----- Original Message ----- >>>>> From: "Michael Amaro" <mikeam...@earthlink.net> >>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>> Sent: Saturday, June 05, 2010 10:39 AM >>>>> Subject: Re: Laptop speakers question >>>>> >>>>> >>>>>> okay guys I am looking for some thing like aportible sub woofer that >>>>>> is maybe USB powered. Some thing like that. With portible speakers >>>>>> ----- Original Message ----- >>>>>> From: "DJ DOCTOR P" <djdoct...@att.net> >>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>> Sent: Saturday, June 05, 2010 5:30 AM >>>>>> Subject: Re: Laptop speakers question >>>>>> >>>>>> >>>>>>> Hello Robert, >>>>>>> If you go back and read his post, it says that he's looking for a >>>>>>> good set of portable lab top speakers with a subwoofer for good >>>>>>> sound. >>>>>>> Sorry to bust your bubble, but you aren't gonna find portable >>>>>>> speakers that runs on batteries with a subwoofer on them. >>>>>>> Those are only available in desktop mottles. >>>>>>> My best regards. >>>>>>> John. >>>>>>> ----- Original Message ----- >>>>>>> From: "Robert doc Wright" <godfea...@wrighthere.net> >>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>> Sent: Saturday, June 05, 2010 8:15 AM >>>>>>> Subject: Re: Laptop speakers question >>>>>>> >>>>>>> >>>>>>>> his main key is that he wanted portable. Desktop speakers with >>>>>>>> subwoofers get very bulky to travel with. >>>>>>>> ----- Original Message ----- >>>>>>>> From: "DJ DOCTOR P" <djdoct...@att.net> >>>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>>> Sent: Saturday, June 05, 2010 3:14 AM >>>>>>>> Subject: Re: Laptop speakers question >>>>>>>> >>>>>>>> >>>>>>>>> Hello All List Members, >>>>>>>>> If you really want to get allot of bang for your buck, go with >>>>>>>>> desk top speakers. >>>>>>>>> Unlike lab top speakers, you get a subwoofer with them so you can >>>>>>>>> hear the bass. >>>>>>>>> They will plug in to the headphone jack on your lab top and or >>>>>>>>> notebook. >>>>>>>>> My best regards. >>>>>>>>> John. >>>>>>>>> ----- Original Message ----- >>>>>>>>> From: "Michael Amaro" <mikeam...@earthlink.net> >>>>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>>>> Sent: Saturday, June 05, 2010 12:22 AM >>>>>>>>> Subject: Re: Laptop speakers question >>>>>>>>> >>>>>>>>> >>>>>>>>>> thanks for the suggestion >>>>>>>>>> ----- Original Message ----- >>>>>>>>>> From: "Robert Logue" <bobca...@telusplanet.net> >>>>>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>>>>> Sent: Friday, June 04, 2010 9:22 PM >>>>>>>>>> Subject: Re: Laptop speakers question >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> There are so many laptop speakers out now. The problem is >>>>>>>>>>> actually getting to hear and compare them before buying. >>>>>>>>>>> >>>>>>>>>>> Some are USB powered. Others run on batteries, either >>>>>>>>>>> replaceable or non-replaceable lithium. Some even have their >>>>>>>>>>> own sound card. Most sound like small speakers. I've read >>>>>>>>>>> reviews for some that make big claims and have bought on >>>>>>>>>>> recommendations to be totally disappointed. I suggest to buy >>>>>>>>>>> locally if possible from a store that will let you return if not >>>>>>>>>>> satisfied. If you go online or mail order, you could spend a lot >>>>>>>>>>> of money returning them if not happy. >>>>>>>>>>> Bob >>>>>>>>>>> >>>>>>>>>>> ----- Original Message ----- >>>>>>>>>>> From: "Robert doc Wright" <godfea...@wrighthere.net> >>>>>>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>>>>>> Sent: Friday, June 04, 2010 6:19 PM >>>>>>>>>>> Subject: Re: Laptop speakers question >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> here is another one. >>>>>>>>>>>> http://www.bhphotovideo.com/c/product/609577-REG/Sharp_DK_AP7N_DK_AP7N_i_Ele gance_Music_System.html#features >>>>>>>>>>>> >>>>>>>>>>>> ----- Original Message ----- >>>>>>>>>>>> From: "Michael Amaro" <mikeam...@earthlink.net> >>>>>>>>>>>> To: "PC Audio Discussion List" <pc-audio@pc-audio.org> >>>>>>>>>>>> Sent: Friday, June 04, 2010 8:16 AM >>>>>>>>>>>> Subject: Laptop speakers question >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>> Hello listers, >>>>>>>>>>>>> What are the best portible laptop speakers to buy? I am >>>>>>>>>>>>> looking for some >>>>>>>>>>>>> thing that has a sub woofer with it as well. For good sound. >>>>>>>>>>>>> Thanks >>>>>>>>>>>>> Michael >>>>>>>>>>>>> E-mail: >>>>>>>>>>>>> mikeam...@earthlink.net >>>>>>>>>>>>> Skype ID: >>>>>>>>>>>>> mikeameli >>>>>>>>>>>>> Windows Live ID: >>>>>>>>>>>>> mikeam...@earthlink.net >>>>>>>>>>>>> " And so my fellow americans ask not! >>>>>>>>>>>>> What your country can do for you? >>>>>>>>>>>>> Ask >>>>>>>>>>>>> What you can do for your country. To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org
