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USB power supply puts 220 Mains power out on USB jack

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Re: USB power supply puts 220 Mains power out on USB jack

#61

Post by paddy_m »

yoodenvranx wrote: post #38
AndrewNCarr wrote: post #32

Earlier quoted context omitted.

If you like AvE, check out This Old Tony. He is more machining focused, but he did do a clever multimeter 4/1 video.

If you are into machining then check out Clickspring, oxtoolco, Abom79, Keith Rucker, Keith Fenner, Shadow HKW, ... If this is not enough then go and visit this list: https://www.reddit.com/r/ArtisanVideos/comments/3v264a/meta_... (But be careful, this is the ultimate rabbit hole)

Keith Fenner is astounding. Years ago my girlfriend said "enough Keith Fenner videos, You have to take a welding class", I did and it was amazing.

As a side note, I'm starting a blog where I interview heavy equipment operators and write about heavy equipment. Anyone here interested in that?

Re: USB power supply puts 220 Mains power out on USB jack

#62

Post by makomk »

PhasmaFelis wrote: post #18
DiabloD3 wrote: post #14

As a reminder, if you're buying a USB charger or battery, or MicroUSB, Type C, or Lightning cable please buy Anker products. They are not expensive, but they are the best products you can get your hands on. I own multiple Anker products, and have never discovered anything better than these. The only non-Anker charger I currently use is the Google Nexus branded Qi charger (plugged into an Anker multiport brick), and t…

The one thing that I can't find from Anker or any other reputable, reasonably-priced supplier (last time I checked, anyway) is a single-port charger that is small enough, horizontally and vertically, to not sprawl out onto adjacent outlets in a power strip. I don't understand why this is so hard. My first smartphone, a Samsung Galaxy Nexus, came with one, but it failed within a year and Samsung wanted like $50 for a…

If you look at some of bigclive's other videos you'll probably understand why it's so hard. Small, single-port chargers skimping on isolation requirements to meet the size restrictions is kind of a long-running theme, most recently https://www.youtube.com/watch?v=tQK2Z0wRND0 A lot of engineering goes into safely fitting power supplies into compact packages and companies want to charge a premium for it.

Re: USB power supply puts 220 Mains power out on USB jack

#65

Post by LeifCarrotson »

marshray wrote: post #51

If you are wondering "How could an isolation transformer ever get past QC with abraded or nicked insulation?", you might find this video interesting: https://www.youtube.com/watch?v=HEJn74Z3wHk

You can still run those through a bed-of-nails tester to verify insulation, continuity, and pinout.

Re: USB power supply puts 220 Mains power out on USB jack

#66

Post by jklp »

Not sure if HN knows about Mehdi Sadaghdar's (aka ElectroBOOM's) YouTube channel, which is somewhat similar - but takes a more lighthearted view on electronics.

E.g. Compare Big Clive's mention of a full bridge rectifier in the video vs Mehdi's YouTube video of the same thing :)

https://youtu.be/sI5Ftm1-jik

Re: USB power supply puts 220 Mains power out on USB jack

#68

Post by digi_owl »

marshray wrote: post #51

If you are wondering "How could an isolation transformer ever get past QC with abraded or nicked insulation?", you might find this video interesting: https://www.youtube.com/watch?v=HEJn74Z3wHk

The cost of us wanting everything cheaper, and yesterday...

Re: USB power supply puts 220 Mains power out on USB jack

#69

Post by marshray »

LeifCarrotson wrote: post #65
marshray wrote: post #51

If you are wondering "How could an isolation transformer ever get past QC with abraded or nicked insulation?", you might find this video interesting: https://www.youtube.com/watch?v=HEJn74Z3wHk

You can still run those through a bed-of-nails tester to verify insulation, continuity, and pinout.

Yeah, that will catch a lot of direct shorts and opens but some problems just don't show up until the device has been thermally cycled and baked in for a few thousand hours of usage. It's also possible that there was another problem in the circuit which caused overheating in the transformer.

Re: USB power supply puts 220 Mains power out on USB jack

#70

Post by duskwuff »

rcthompson wrote: post #59
farnsworth wrote: post #50

Earlier quoted context omitted.

Anker is fantastic. With one weird exception - when I use my Anker USB to Ethernet adapter, my (Microsoft brand) wireless mouse stops working unless it put it right next to the USB receiver. I bought a much crappier-looking Ethernet adapter and had no issues.

I believe many USB3 devices emit noise in the 2.4 GHz spectrum, jamming nearby WiFi and Bluetooth.

Yep. This is a known issue, and there are ways hardware manufacturers can mitigate it:

http://www.usb.org/developers/whitepapers/327216.pdf

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