tag:blogger.com,1999:blog-7900618699190547567.post5590629613164907572..comments2023-06-03T08:55:15.982+01:00Comments on The BiT Bang Theory: Adding an external power supply to a cheap USB hubmsaleirohttp://www.blogger.com/profile/15235655491809711811noreply@blogger.comBlogger42125tag:blogger.com,1999:blog-7900618699190547567.post-86840958493369567252013-08-06T22:42:36.258+01:002013-08-06T22:42:36.258+01:00Well there is no leak between VCC to negative, and...Well there is no leak between VCC to negative, and doesn't seem like that with the D+ or D- either, might just have to get a new one and start over. The hub worked fine before. Thanks for the reply! :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-47224199321531563802013-08-06T17:28:02.597+01:002013-08-06T17:28:02.597+01:00Hi! Maybe you should try to check if all the wires...Hi! Maybe you should try to check if all the wires VCC, D+, D- and GND are correctly soldered. In some hubs the cables are very thin and sometimes they get broken or desoldered during the hack. By the way, did you test your hub before modifying it?msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-66292137702229786412013-08-06T16:03:00.218+01:002013-08-06T16:03:00.218+01:00Actually gives me "USB Device Not Recognized&...Actually gives me "USB Device Not Recognized" when I plug a device in, doesn't recognize the hub itself.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-18729213216386254662013-08-06T15:54:51.068+01:002013-08-06T15:54:51.068+01:00Hello, I did this with mine, but now whenever I pl...Hello, I did this with mine, but now whenever I plug it in it gives me the "USB Device Not Recognized" message. Tried different 5v supplies with different amps, namely 350mA and 2000mA. I've also used a volt meter to verify its constantly at 5v. Makes no difference, Any suggestions?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-28131596227054031872013-07-15T02:10:54.569+01:002013-07-15T02:10:54.569+01:00Hi! I'm sorry but I couldn't completely un...Hi! I'm sorry but I couldn't completely understand you explanation. However, maybe you should check this image that explains how to make the connections: http://www.head-fi.org/content/type/61/id/693652/width/500/height/1000/flags/LL<br /><br />Instead of the phone you'll have your android tablet.Just make sure you cut the red wire (VCC) that goes to the tablet so that no current is pushed into it or pulled from it.<br /><br />I suggest you to make the cable in two steps: (1) make a simple cable for hard drive + power supply, connect both and make sure the hard drive lights up; (2) add the third connector that goes to the phone.<br /><br />by the way, be careful if you're using cheap chinese cables. Sometimes the colors of the inside wires are not correct. Hope to have helped. If you have any other questions, feel free to ask them. msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-272972805382466432013-07-14T23:41:24.511+01:002013-07-14T23:41:24.511+01:00Need some serious help...
I have a Android tablet...Need some serious help... <br />I have a Android tablet and want to connect a external hard drive to it...<br />Drive is self powered and my Galaxy tab 2 cannot supply enough power..<br /><br />I needed a y-csble to power it from a source and use with the tablet<br /><br />I made the c as ble in the following way<br />Cut a usb extension cable (male - female) and srip off the data +/- , 5v & grnd cable..<br />Simmilarly with a usb male cable<br /><br />Now I choosed ine usb male cable for power supply and tapped the red and black wire of it to the usb female cable<br />The other male cable was for data transfer so connected the other two wires of it to the female cable.<br /><br />Now the power cable in the usb wall charger...<br />Hard drive was connected to female cable..<br />And the third one to the otg of tablet<br /><br />Sadly it doesn't work...<br />Even hard drive doesn't light up...<br />Connecting it directly with the same source lights it up..<br /><br />Tell me what should I do ?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-4436926100920056762013-07-14T12:09:22.638+01:002013-07-14T12:09:22.638+01:00Hi! I guess you'll have to be lucky since it i...Hi! I guess you'll have to be lucky since it is probable that some of these may come with wrong labeling. However, the one shown in this article shows up in Ubuntu as Genesys Logic, Inc. USB 2.0 Hub / D-Link DUB-H4 USB 2.0 Hub and when I type the command "lsusb -v" the field bcdUSB shows 2.00. So, the one I used is really a 2.0 USB hub, but there may be other similar hubs that are not :\msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-84397416849186573462013-07-14T11:36:12.580+01:002013-07-14T11:36:12.580+01:00Are these cheap hubs definitely USB 2.0? I read a ...Are these cheap hubs definitely USB 2.0? I read a post somewhere saying that even though USB 2 was written on the case, the transfer speeds were really poor and more like USB 1.1.stuckinstandbynoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-12366588972973341942013-06-17T10:22:00.120+01:002013-06-17T10:22:00.120+01:00As long as you connect only the ground and not the...As long as you connect only the ground and not the VCC you should be fine :) A diode is not necessary. Just make sure that the power supply that you have is in good working conditions :)msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-81329050572536688762013-06-17T03:07:12.812+01:002013-06-17T03:07:12.812+01:00Are there any concerns with ground connected from ...Are there any concerns with ground connected from two different power supplies? Should I put a diode inline with the ground from the auxiliary power supply? (I intend to use a 5v rail from a 650W computer power supply I have set up as a charging station supply built into my workbench, so it's a nice, regulated supply...)Anonymoushttps://www.blogger.com/profile/02874033088740137535noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-83370844823179476432013-05-27T15:39:31.295+01:002013-05-27T15:39:31.295+01:00That's an interesting thought but I think what...That's an interesting thought but I think what applies to computers also applies to smartphones with OTG capability. If you plug a USB pen drive into a USB OTG cable connected to the smartphone, it will power the pen drive. Electrical current will flow from the smartphone to the USB device. I don't now how the USB controller on the smartphone manages the connection to switch between a device and a host. Maybe in device modive it accepts current and in host mode it delivers current...msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-68714818811900681532013-05-27T15:20:51.512+01:002013-05-27T15:20:51.512+01:00I _think_ that if you don't cut the VCC from t...I _think_ that if you don't cut the VCC from the USB input, you can use the hub with a USB OTG supporting Smartphone and power the phone as well as use the hub with it.Tachyonhttps://www.blogger.com/profile/09347922142101309671noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-59802615047802736622013-05-26T20:07:33.037+01:002013-05-26T20:07:33.037+01:00Ah ok..
I had been thinking about powering an unpo...Ah ok..<br />I had been thinking about powering an unpowered hub. What concerned me was how does the hub know it was powered now. As in unpowered mode it knows it can distribute 400mA over 4 ports. But in powered mode it can distribute 2000mA over 4 ports. So it can power more power hungry devices. I was afraid there was some pin you needed to put voltage on if the hub has external power, that else it would still only allow 4 low power usb devices. Even if it has capacity for more with external power.Anonymoushttps://www.blogger.com/profile/02904318904842931695noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-58584696930442283612013-05-26T14:55:31.498+01:002013-05-26T14:55:31.498+01:00Yes, I think it can be considered as a modificatio...Yes, I think it can be considered as a modification since I only found out that it had the holes for the power connector by opening it and inspecting the pcb. Moreover, although in this case the holes were already there, I describe it in a way that anyone can add external power to any hub, even if it doesn't have the holes :) I was just lucky to get this one :) If it didn't have the holes I would have added the external power anyway :P Thanks for your comment :)msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-57739544619523381542013-05-26T14:52:18.951+01:002013-05-26T14:52:18.951+01:00Arend-Paul, yes a schottky diode would be more app...Arend-Paul, yes a schottky diode would be more appropriate and would probably work without any issues. Regarding the switch of the connector, in this picture you can see that both the side pins of the connector are in the same pcb track and therefore the switch of the connector has no effect: https://picasaweb.google.com/103809777771058938576/AddingExternalPowerToCheapUSBHub#5785826801600536226<br />With some tweaking it could be done as you said but since I didn't need it for my application I didn't do it. Thanks for your suggestions :) I'm sure they'll help others :)msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-78380472065789291092013-05-26T14:47:17.019+01:002013-05-26T14:47:17.019+01:00Yes, that could also be done by placing a switch i...Yes, that could also be done by placing a switch in the 5V wire that I cut :)msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-8435985979319987852013-05-26T13:59:54.593+01:002013-05-26T13:59:54.593+01:00Very nice, and fortunate you found a hub that was ...Very nice, and fortunate you found a hub that was intended to have an external supply :) could this really be considered modification though, considering the manufacturers already had the board made that way? :P awesome job!<br /><br />-GtrStitchAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-70398858733559251422013-05-26T12:19:30.326+01:002013-05-26T12:19:30.326+01:00Or use a schottky diode, which only has a voltage ...Or use a schottky diode, which only has a voltage drop of 0.2v.<br />Useally the type of connector you used has a build in switch, so if you plug in external power the batteries of a device are disconnected.<br />Hence the 3 pins on the connector. Did you check with an ohm meter if the power coming over usb from a pc is disconnected by the switch if you insert a plug in the connector ? The tracks are a bit hard to make out in the pictures, so i cant really see if external power goes to the switch pin of the connector.Anonymoushttps://www.blogger.com/profile/02904318904842931695noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-24081858566759892122013-05-26T08:39:08.608+01:002013-05-26T08:39:08.608+01:00Maybe the good thing to do is to add a switch to s...Maybe the good thing to do is to add a switch to selec the power source : Usb or Externalselphttps://www.blogger.com/profile/10266705367230083637noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-39590031906608540062013-05-26T03:04:44.588+01:002013-05-26T03:04:44.588+01:00Yes, if you cut the VCC wire it won't work unl...Yes, if you cut the VCC wire it won't work unless externally powered. Adding a diode might work if the hub electronics are able to work with a power supply of 4.3V (due to the 0.7V voltage drop of the diode). Thanks for your comment :)msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-34514451381124765592013-05-26T02:45:27.805+01:002013-05-26T02:45:27.805+01:00Very nice work! But cutting the VCC to the compute...Very nice work! But cutting the VCC to the computer means you can't use the hub if not externally powered, right? I bought a no-brand powered hub and I noticed that whenever it was connected, it would power the port that connects to the computer. I was going to cut VCC to the computer as you did there, but I wonder if a diode would solve this problem instead.Anonymoushttps://www.blogger.com/profile/04341196055517410789noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-3192471495142772762013-03-25T23:38:30.684+00:002013-03-25T23:38:30.684+00:00Yes, you can :) just make sure that the red wire f...Yes, you can :) just make sure that the red wire from the USB cable that connects to the RasperryPi (the one you have cut) isn't touching anythingmsaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-16583232884906974472013-03-25T19:34:44.492+00:002013-03-25T19:34:44.492+00:00Sir can i after cutting the red wire, directly con...Sir can i after cutting the red wire, directly connect the external power cables to the circuit?<br />Mahad Khaliqhttps://www.blogger.com/profile/15334246459763898878noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-39184614144206419612013-02-17T16:53:43.518+00:002013-02-17T16:53:43.518+00:00http://imageshack.us/content_round.php?page=done&a...http://imageshack.us/content_round.php?page=done&id=4tHclKKklaKqlqiS2-Ld0evRo83b2g are those the right holes?yoyojessehttps://www.blogger.com/profile/11396620462150771734noreply@blogger.comtag:blogger.com,1999:blog-7900618699190547567.post-37928383076528428142013-01-24T10:47:01.912+00:002013-01-24T10:47:01.912+00:00Hi Thomas! Unfortunately it has no reference about...Hi Thomas! Unfortunately it has no reference about the model. I bought it in a local chinese shop and it was the cheapest thing I could find. The only thing written on the PCB was something like wwww.medotech.com.cn but I tried searching for it and found nothing :\ msaleirohttps://www.blogger.com/profile/15235655491809711811noreply@blogger.com