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Exposing some fake electronics with too-good-to-be-true prices
[Giorgos Lazaridis] needed an AC adaptor for his Canon PowerShot camera. He hit eBay and was excited to find this branded adaptor for just five bucks! It works and, even though it would sometimes...
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Over-engineering a two-zone thermometer
We love the extra touches that [Andrianakis Haris] added to his two-zone electronic thermometer. It includes features that you just wouldn’t find on a mass-market commercial product because of issues...
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Batterys,and charging methods for 12V,7Ah Pb.how many can I charge at once...
EV Battery Warmer Part 2 by bennelson Old car battery power back-up by hendrosutono Use One Less Battery by mistercaboose How To Jumpstart A Car by mbenge Make a solar battery charger in 5min by Asa J...
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Power protection circuit tutorial
Building your first circuit is empowering, but make sure it’s not too empowering. [Jon] sent in a great tutorial of power protection circuits to make sure you don’t release the mystical blue smoke...
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Backplane and mainboard for a 6502 computer
[Quinn Dunki] has been busy through the holidays giving her 6502 processor-based computer a place to live. The most recent part of the project (which she calls Veronica) involved designing and etching...
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Securing your Keurig with RFID
[Andrew Robinson] and his co-workers are lucky enough to have a Keurig coffee maker in their office, though they have a hard time keeping track of who owes what to the community coffee fund. Since...
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Followup: Reproducing impossible circuits
Last month we caught wind of an impressive display of troll physics. [Fredzislaw100] out of Poland posted a video of a circuit that should not exist. As expected, the comments in our coverage blew up...
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Running the numbers on a cheap PSU
[Mike] picked up a cheap USB hub for four pounds (about $6) including delivery. He wanted to know how it’s possible to get quality electronics for that price, and as you may have guessed it’s not...
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Using 555 timers to add “free play” functionality to classic arcade machines
[John Zitterkopf] is in the middle of restoring a vintage Sega Star Trek Captain’s Chair arcade game for the upcoming 2012 Texas Pinball festival, though one prerequisite for the show is that the game...
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Minimalist RGB LED cube has a very short BoM
[Asher Glick] wrote in to share a project he has been working on with his friend [Kevin Baker], a 4x4x4 RGB LED cube. The pair are students at Rensselaer Polytechnic Institute and also members of the...
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