Questions tagged [hub]

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1answer
44 views

USB Downstream Port (with Power Charging) [closed]

I have a Dell UltraSharp 32 4K USB-C Monitor: U3219Q with a USB Downstream Port (with Power Charging). I have the monitor connected to my laptop via USB-C. If I connect a USB device (let's say an ...
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2answers
66 views

Why does 10BASE-T require hubs?

As I understand it, some of the physical layer options for Ethernet include:\ 10BASE5 (now considered obsolete): a single length of thick coaxial cable. 10BASE2: thin coaxial cable, of which multiple ...
4
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1answer
140 views

Do we need an IC to make a USB hub?

I am planning to make a USB hub for my PC. I was thinking about just making it like this: When I search the internet for circuit diagrams, there are many circuit diagrams with an IC. Must an IC be ...
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0answers
98 views

Designing 7 port USB hub for a custom project

I am attempting to design a basic 7 port USB hub that will be used in a custom 3D printed case. It will connect to a FPGA device and be powered by a 5V adapter through a barrel plug. I'm stuck on a ...
3
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1answer
96 views

Why can't you make a thunderbolt 3 hub?

So laptops with thunderbolt 3 are pretty common, docks are common, every other kind of USB seems to be able to be used with a hub. I know thunderbolt 3 can be daisy chained, theoretically eliminating ...
3
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2answers
163 views

Adding HDMI To A USB Type-C Hub Design

I've been working on this design for a client for a little while now. I can't go into full specifics on it but the basic design is a USB hub. The IC I picked at the time met the design requirements ...
1
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1answer
89 views

Is it possible to use ethernet communication between MCUs without using a hub or switch?

Is it possible to connect some MCUs together in a star topology, without using any hub or switch? EDIT: There will be a main MCU in the star topology and it will be receiving 2 different GPS datas (...
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2answers
119 views

PCB with multiple Arduinos and onboard hub

I'm designing a PCB for an astronomical observatory which needs several Arduino Micro to control different devices. Since the circuit must fit a very small space, I'm putting an onboard USB hub to ...
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0answers
41 views

Should I use Multi Transaction Translator?

I'm designing a board which has two USB 2.0 Full-Speed (12 Mbps) USB-UART controller (CP2108). These controllers will be communicating with the PC via an USB2422 HUB. This hub has got a Single ...
1
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3answers
365 views

In a Shimano dynamo hub with 6V regulator is the rest of the power being wasted?

I bought a Shimano hub dynamo that gives a maximum of 6 V with a regulator that they have provided. From what others here have said, the regulator is a Zener diode. The output voltage of the dynamo ...
1
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0answers
64 views

USB 2.0 Maximum current through hub

I have a question regarding USB2.0 power negotiation. I'm in the process of improving the design of a support equipment PCB that utilises an FT232H chip. The layout of the current board consists of ...
1
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1answer
490 views

USB2517 USB hub unable to enumerate

I've made a USB hub PCB using a USB2517 controller, but it's not working. When I plug it into the host computer, I get a "not recognised" message on Windows and "unable to enumerate" message on Linux. ...
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0answers
124 views

Why wont Micro USB Hub work with UVC Receiver?

I want to charge my phone and be able to receive wireless signal via a UVC Receiver. So I ordered a Micro USB Hub Adapter that supports OTG and charging. Well, I tested the hub adapter today, but the ...
0
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1answer
72 views

USB3/2 hub cascading (reverse hierarchy)

I want to implement multiple USB ports using one USB3.0 and one USB2.0 hub with four ports each. The microprocessor I want to implement these ports for has just a single USB3.0 port left (of which the ...
2
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3answers
397 views

USB hub inside modular keyboard for comunication

I'm working on a personal project which consists on a keyboard that also serves as a hub in order to connect more keyboards. For example, I could have the main keyboard with the letters and symbols ...
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3answers
1k views

GL850G-SSOP28 datasheet - Ferrites values? [closed]

I have found a circuit for using the GL850G chip to build a powered USB 2.0 hub: http://pdf-file.ic37.com/uploadpdf_old/GENESYS/GL850G-SSOP28_datasheet_898289/146940/GL850G-SSOP28_datasheet.pdf ...
2
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1answer
679 views

Bldc hub motor starting torque

am designing a BLDC hub motor (48V-500W-15A max) I have designed a three phase inverter and the motor run normally with smooth rotation and as the motor start running and I apply the load the motor ...
5
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3answers
15k views

Can I Build My Own USB Hub? [closed]

Would it be possible to make a USB Hub from scratch? Like, designing a PCB, and hand soldering components on to it? What microchip would I have to use as the controller? Is there a simple controller ...
0
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1answer
364 views

Hub usb connected to ATX of the same desktop pc [closed]

I am new here and I am newbie in electronic. I studied electronic a lot of years ago. I am attempting to connect my usb hub to 5V output of my ATX of desktop pc, as explained here: Can an ATX PSU ...
1
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1answer
3k views

Cloning a USB signal - feed two USB hubs with one input port

I have a schematic for a 4 port USB hub (4 output ports, 1 input port). I'd like to make two of these hubs and connect them together, thus making a 7 or 8 port USB hub on a single PCB. I know there ...
2
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2answers
355 views

LED hub purpose?

What is the main purpose of LED hub, is it used only for RGB matrices to connect shift registers for every color or there are some other applications? I'm working with HUB75 and that is the reason ...
2
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1answer
605 views

choosing diodes for a passive ethernet hub

I found several guidelines for building a passive ethernet hub, mostly quoting this. The guide specifies which diodes to use, but I cannot find them anywhere. What are the parameters I should search ...
1
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3answers
531 views

Wheel speed from Shimano dyamo hub using arduino

I'm trying to figure out a way to extrapolate wheel speed from the Dynamo hub I just purchased. I outputs 6V 3W AC, and I would like to potentially measure it using an arduino if possible, I' assuming ...
0
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1answer
1k views

Make simple 3 port ethernet switch/Hub [closed]

How can I make a simple cheap 3 port Switch? I have 30 10-base low speed Ethernet devices and I want to connect them together, how can these devices connects together with simple Bus topology? ...
5
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2answers
3k views

Homemade ethernet hub not working with three computers [closed]

I am trying to connect three computers in one network. I have connected the wires like the photo. I works with two computers but not three computers at the same time. For example, let's name the ...
1
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0answers
320 views

USB hub acting differently towards another hub and device

I have a USB hub that supports individual port-switching. I'm shutting off a port using the libusb library. When there is nothing connected to the port, the power pin drops from 5V to 1.5V and slowly ...
0
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1answer
548 views

Passive Ethernet Hub / Point to Multipoint Ethernet

I have a device which needs to connect to one of three devices using ethernet. When one device is connected, the other 2 will be powered down. Power consumption is a factor, so I'd like to use a ...
0
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1answer
606 views

External powered USB hub

I am planning on building a quite large USB hub, which final use is to connect, charge and sync let's say 40 iPads. The iPad electrical specification from Apple states that each unit needs to have ...
-2
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2answers
593 views

raspberry pi + USB Hub [duplicate]

I bought a cheap USB Hub Powered to connect my Raspberry Pi and two External Seagate HD (USB 2.0/3.0), but obviously that 400 mA is not enough for all this things. So, I want to buy a new AC Adpater ...
5
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2answers
791 views

Question related self powered USB Hub

We have a requirement, which is a normal self powered USB Hub, with individual power control of the ports, i.e in addition to a normal Hub, we want to remove the power to any of the downstream port on ...
8
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4answers
4k views

Ethernet Without a Switch?

How do you wire up Ethernet electrically without a switch? An approximately equivalent phrasing of this question would be what is going on electrically inside an Ethernet Hub? To clarify, I'm not ...