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USB Power Supply Nannies And The People Who Hate Them

USB Power Supply Nannies And The People Who Hate Them | Hardware Hackery Hootenanny | Scoop.it
[Paul] recently purchased an inexpensive USB power pack, hoping to use it for powering small electronics projects. Unfortunately it has been designed to only stay on when a device is drawing a lot ...
Aaron Gilliland's insight:

Argh. This has happened to me at least 4 times: I need to power a small board via USB, so I buy a cell phone charger with the appropriate plug... only to discover that the charger's controller wants a constant load and will shut off if it doesn't see one. This is all KINDS of annoying since the project boards don't draw a constant current - that would be a waste of power and throw off heat for no reason. The result is unstable and unpredictable behaviour of the board.

 

One solution, from the link, is to use a microcontroller to periodically draw a large pulse of current. The power supply can be tricked into staying on. It's a bit like keeping a phone call connected; if the person on the other end hears nothing for 10 seconds, they may assume that the call is over and decide to hang up, but if the caller says "Yep" or "Still here" every few seconds, the call is still active.

 

What an odd comparison. Anywho, it's a clever solution.

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YAARR (Yet Another Arc Reactor Replica)

YAARR (Yet Another Arc Reactor Replica) | Hardware Hackery Hootenanny | Scoop.it
My attempt at a more authentic replica of the iron man arc reactor.

Via Jinbuhm Kim
Aaron Gilliland's insight:

Instructables user Duck210 dishes his plan for his very own Arc Reactor. What's really shocking: the number of Arc Reactor Replica projects on Instructables.

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Cheap Power Supplies Supply Power Poorly; Fire Hazards, Headaches Included

Pulling apart a too-cheap-to-be-true PSU. Guess what... it was too cheap.
Aaron Gilliland's insight:

A lulzy look at a cheap power supply from China. "mikeselectricstuff" bought a powered USB hub for £4 and found this normal-looking power supply inside. We don't expect much from a power supply; give us a steady output voltage at a range of current draws and we're happy. You don't have to blink or sing and dance, you don't even have to look pretty. THIS power supply fails even its most basic requirement. Czech out the test.

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Custom Hard Drive Controller Board? NOOOO!!!!

Custom Hard Drive Controller Board? NOOOO!!!! | Hardware Hackery Hootenanny | Scoop.it
Aaron Gilliland's insight:

Needed a cheapo SATA drive for a desktop. Go to Staples and find an external USB drive at the right price. 

 

Inner monologue: "Oh I should get that; surely it's just a 2.5" SATA drive in a USB enclosure..."

 

Buy. Open. Look.

 

CUSTOM DRIVE CONTROLLER BOARD. EVEN THE USB PORT IS NON-STANDARD.

 

Now I get to pull the board and see if I can wire it to a standard female SATA port. FML.

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Flea Market MacGyver's Pocket Power Supply

Flea Market MacGyver's Pocket Power Supply | Hardware Hackery Hootenanny | Scoop.it
I am a big fan of garage sales, flea markets, and thrift stores. They are great places to find used parts and materials for your next project. But one problem that I often run into is not being abl...
Aaron Gilliland's insight:

Well this is just all sorts of awesome. The linked project lets you make a small universal power supply. It isn't pretty, and it isn't something you'd use for primary power long-term, but it can make quick power-on tests soooo much easier. Just connect a battery, select the output voltage via switched resistors, and voila. Mullet not required, but it wouldn't hurt.

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