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In Reply to: RE: A USB Gizmo posted by Ryelands on April 08, 2016 at 14:19:10
Sounds like a good test to pull off while the mobo is still under warranty. Blow the motherboard if it is improperly designed...
There is no excuse for selling a power supply (or an amplifier) that is damaged when driving any kind of load from open to shorted.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
This is the story of computer part design for cheapness! You pay $100 for a complex board with many many components. What do you expect?
Section 7.2.1 of the USB specification requires that powered ports provide protection against overloads. Protective devices cost less than 0.2 €.
There is a lot of cheap junk out there, to be sure... Hence my suggestion to do the testing while the product is under warranty.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
reality is another.
We still have usb fobs (nominally very good ones) that behave differently when inserted, with different speeds on different computers, and usb bridges that don't work on some computers.
Hence the sometimes universal serial bus still rules. This happens even on Intel boards and should NOT be the case.
We still have usb fobs (nominally very good ones) . . . This happens even on Intel boards and should NOT be the case.
OTOH, Intel are nominally very good boards. It seems fair to ask if the fault lies with the fobs or with the boards.
D
I wasn't talking about whether the data worked or not, or even if a power cycle was needed before things worked again. I was talking just about damaging the USB port. I would be surprised if an Intel board were damaged when connected to a short. I feel the same about audio power amplifiers. These can oscillate into certain loads, in addition to current limiting problems. In either case, I don't want to have anything to do with them, no matter how good they may sound under other circumstances.
I had a 1960's vintage aircraft transceiver and it blew the RF output transistor when running with the antenna disconnected. (Actually, the problem was a bad contact, not installation error.) This unit had been made in southern California. A few years later the company went out of business after the manufacturing plant burned to the ground. Later, I bought a nice German transceiver that worked reliably for over 20 years. It turns out that the German aircraft certification requires running test units continuously for 30 minutes into open loads and into shorted loads. It then must immediately pass its certification tests.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
I was talking just about damaging the USB port. I would be surprised if an Intel board were damaged when connected to a short.
Maybe I misundersatood fmak's point but late last night I recalled how, not too long ago, I plugged a known-good (and still good) USB DAC into a small Intel mobo while doing a friend a favour. The board promptly died on me. On reflection, plans to try that pre-charged 500uF OS-CON USB filter thingie are currently on hold . . .
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