Maybe you mean Aker ? there is a big company with this name.
If you happen to come send me an message and we can meet here
These based at Asker
https://www.tomra.com/en/
I'll let you know if I ever get over, they usually come and visit us
5 extra wires !
Or 1 extra wire added to the 4wire connection of the earlier USB cables?
Yeah the original 100mA was rather low... Like you say many things now should have external power, but cost is quite often a major factor, in all computer peripheral and related products, so often design compromises are made whilst still trying to keep to spec and avoid EMC issues.
Found this Max with 20 awg power cables instead of the more common 24 awg
USB Revision 2.0 Compliant Bulk Cable - 20 AWG Power Conductors
10mOhm/ft instead of 25mOms/ft
Found this Max with 20 awg power cables instead of the more common 24 awg
USB Revision 2.0 Compliant Bulk Cable - 20 AWG Power Conductors
10mOhm/ft instead of 25mOms/ft
FFS, the pocket hard drive works correctly on any PC when using the inbuilt captive short cable with male USB Type A plug.
I have M-F extension cables....some allow correct HD initialisation and operation, other extension cables do not allow initialisation and therefore no operation.
The fault is evidently because of excessive voltage drop in the power/ground conductors, ie FA copper.
So does anybody know of a source of properly compliant USB 1.0/2.0 actual cable please ?.
Dan.
These based at Asker
https://www.tomra.com/en/
I'll let you know if I ever get over, they usually come and visit us
Perfect ! let me know. I will be here until October.
Kind regards, gino
To busy being sarcastic, so here it is again...
USB Revision 2.0 Compliant Bulk Cable - 20 AWG Power Conductors
USB Revision 2.0 Compliant Bulk Cable - 20 AWG Power Conductors
As I said in post 29, galvanic isolators can worsen measured specs. So why couldn't cables/treatment that reduce noise help improve specs? To me the cable is just a different kind of isolator, whether the goal is to transfer further or not. It also inherently breaks ground loops.
Its does not isolate VBUS or the GND connection please look at the data sheet, it is only data that is transmitted down the optical section of the cable, it has to have VBUS and GND to function... It doesn't break any imagined ground loops.
Further with digital signals you need a decent return path in close proximity to the signal, USB requires this because some of the handshaking is single ended signalling so requires a decent return path or you will actually increase noise.........
Cables don't reduce noise, they can be shielded which reduces noise pick up, but cables themselves do not reduce noise, filters do that..... Cables do attenuate the signals and noise passing down them but this is not actively reducing noise... Russ Andrews got a wrist slap for claiming such a thing....
Further with digital signals you need a decent return path in close proximity to the signal, USB requires this because some of the handshaking is single ended signalling so requires a decent return path or you will actually increase noise.........
Cables don't reduce noise, they can be shielded which reduces noise pick up, but cables themselves do not reduce noise, filters do that..... Cables do attenuate the signals and noise passing down them but this is not actively reducing noise... Russ Andrews got a wrist slap for claiming such a thing....
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Couldn't say, here's some circuit notes for the device with eye diagram of the data..
http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0160.pdf
Somewhere in the back of my mind I do remember something about the power conversion through the devices being a bit noisy, but it was years ago on some project, we had to add a separate tyco PTH power isolator, so maybe it could be that. I am going back years here maybe 12 or so...
http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0160.pdf
Somewhere in the back of my mind I do remember something about the power conversion through the devices being a bit noisy, but it was years ago on some project, we had to add a separate tyco PTH power isolator, so maybe it could be that. I am going back years here maybe 12 or so...
Further notes on the Adums and EMC...
http://www.analog.com/media/en/technical-documentation/application-notes/AN-0971.pdf
Notes on Ti's isolators....
http://www.ti.com/lit/an/slla198/slla198.pdf
http://www.analog.com/media/en/technical-documentation/application-notes/AN-0971.pdf
Notes on Ti's isolators....
http://www.ti.com/lit/an/slla198/slla198.pdf
You can add a switch on the ground and open it after the initial se0 handshake. This will sometimes remove ground noise at the risk of a voltage buildup from the lack of gnd reference. A 1meg resistor across the switch might avoid the voltage buildup and offer a reduction in noise. It's an easy test.
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