[Eric] has an Atwater Kent 55C AM radio from the early 1900’s. He’s been trying to restore the radio to proper working condition. His most recent pain has been with the rectifier tube. The tube is supposed to have a complete vacuum inside, but that’s not the case here. When the tube is powered up, it glows a beautiful violet color. It may look pretty, but that’s indicative that gas has leaked into the tube. It needed to be replaced.
[Eric] had a tube that would serve as a good replacement, but it’s plug didn’t fit the socket properly. He was going to have to use this old broken tube to make an adapter. Rather than just tearing the old tube apart, he decided to have some fun with it first. He hooked it up to a variac, an ammeter, and a volt meter. Then he slowly increased the voltage to see what would happen. The result was visually stunning.
The tube starts out with the same violet/blue glowing [Eric] experienced previously. As the voltage increases, it gets more and more intense. Eventually we start to see some green colors mixing in with the violets. [Eric’s] reaction to this unexpected result is priceless. As the tube gets increasingly hot, the anode starts glowing an orange-red color. Finally, the filament starts to crackle like a sparkler before the tube just gives up and completely fails.
After the light show, [Eric] moves on to replacing the tube. He begins by tapping on the old tube’s socket with the end of a screwdriver. After much tapping, the glass starts to come lose from the socket. After a bit of wiggling and twisting the tube finally came free from the socket. [Eric] luckily had an unused octal socket that fit perfectly inside of the old socket. All he needed to do to build his adapter was to connect the four pins from the old adapter to the proper pins on the octal socket. Piece of cake.
…Or so [Eric] thought. After testing some new tubes with a tube tester, he realized he had soldered all four pins incorrectly. On top of that, he had super glued the adapter together. He eventually got the two pieces apart. This time he removed all of the unused pins from the octal socket so he wouldn’t get it wrong. Another run on the tube tester confirmed that everything looked good. After plugging the tube into the radio, it worked just as expected
If you need fabrication rather than repair, we’ve got you covered there as well. Check out [Charles Alexanian’s] process for making new vacuum tubes in his garage. Now if you just have too darn many of them around, you can always decorate your pad with ’em.
Continue reading “Vacuum Tube Repair After a Spectacular Failure”
VGA, DVI, and HDMI ports use Display Data Channel (DDC) to communicate with connected displays. This allows displays to be plug and play. However, DDC is based on I2C, which is used in all kinds of electronics. To take advantage of this I2C port on nearly every computer, [Josef] built a VGA to I2C breakout.
This breakout is based on an older article about building a $0.25 I2C adapter. This adapter hijacks specific lines from the video port, and convinces the kernel it’s a standard I2C device. Once this is done, applications such as i2c-tools can be used to interact with the port.
[Josef] decided to go for overkill with this project. By putting an ATmega328 on the board, control for GPIOs and LEDs could be added. Level shifters for I2C were added so it can be used with lower voltage devices. The end product is an I2C adapter, GPIOs, and LEDs that can be controlled directly from the Linux kernel through an unused video port.
Phones, MP3 players, designer bags, artwork, money…. anything with value will bring out the counterfeiters looking to make a quick buck. Sometimes the product being counterfeited isn’t even necessarily expensive. For example, an Apple iPad Charger. [Ken Shirriff] got a hold of a counterfeit iPad Charger, took it apart, and did some testing.
So why would someone buy a counterfeit product? To save some money! The counterfeits are usually cheaper to reel the potential buyer in thinking they are getting a deal. In this case, the Apple product costs $19 and the knock-off is $3, that’s a huge difference.
Continue reading “More Counterfeit Apple Chargers Than You Can Shake An iPod At”
In all of Microsoft’s grand wisdom they found it necessary to make the new Xbox One headset adapter without a standard 2.5 mm headset jack. People have invested great amounts of money in quality headsets for previous game platforms that now cannot jack into the Xbox One controllers. This may seem like a déjà vu hack from a week ago but it is different and adds more solutions for the annoying Xbox One headset compatibility problem.
[Jon Senkiw] A.K.A [Xandrel] wasn’t having any of this Microsoft nonsense so he cracked open the headset adapter case that plugs into the Xbox One controller. He photographed the PCB and wiring and realized he could fit a 2.5 mm headset jack from an old donor cellphone into the case. A dap of hot glue, some AWG 30 jumper wires and a bit of plastic trimming was all it took to get a jack inside the headset adapter just the way Microsoft should have done from the factory.
Previously when [octanechicken] added a 2.5 mm female phone adapter at the end of the cable he did not connect the black wire to anything being it was the 2nd side of a push-pull speaker. However, from looking at [Jon’s] photos he connected the speaker output wire to a solder pad on the PCB where the black wire originally connected, marked HPL, and he had nothing connected to the HPR pad. This seemed to work for [Jon] just fine, but is the opposite of what [octanechicken] did last week when he connected the blue wire to the speaker output which would have traced back to the HPR pad on the PCB.
This hack makes these controllers backwards compatible without too much issue being reported. If you have issues please report here or on [Jon’s] SE7ENSINS thread. He has also made comments on the thread that he is willing to help mod headsets, so if you’re not able to hack this yourself [Jon] might be willing to help.
As most everyone knows the Xbox One came out last week and if you were one of the lucky few to get one you might have noticed the headset is quite uncomfortable and covers only one ear. [octanechicken] has a possible adapter solution that lets you plug-in an older more comfortable chat headset like a Turtle Beach. It is being reported as a functional hack by others in the comments; however it may still be questionable. We say questionable because the first release of this Instructable clearly had a flaw in the wiring, but updated text seems to have fixed that problem. Using a female 2.5 mm stereo inline jack [octanechicken] was able to get the Xbox One headset controller to work with older Xbox 360 chat headsets having a male 2.5 mm plug.
The photos on the instructable are still incorrect so following the text instructions one simply unsolders the wires from within the ear piece and then solders the white wire to the tip connector, blue wire to the middle ring connector and the bare wire to the rear sleeve connector of the female 2.5 mm stereo inline jack. Remember to leave the black wire disconnected and covered with a bit of tape. If you cut the wires instead of unsoldering them, remember to scrape any varnish off before soldering. But what about that black wire?
Continue reading “2.5 mm Jack Adapter for the Xbox One Headset”
This Fail of the Week will remind our readers that every project they make, no matter how small they might be, may have big consequences if something goes wrong. Shown in the picture above is an oven that [Kevin] tweaked to perform reflow soldering. The story is he had just moved into a new place a few weeks ago and needed to make a new batch of boards. As he had cycled this oven many times, he was confident enough to leave the room to answer a few emails. A few minutes later, he had the unfortunate experience of smelling something burning as well as discovering white smoke invading his place.
Continue reading “Fail of the Week: How a Cheap USB AC Adapter Might Indirectly Burn Your House Down”
The Raspberry Pi foundation is in a somewhat unique position. They always test the units that get returned to them in hopes that they can improve the design. They often request that the power supply also be sent back with the RPi unit, as we know the board will not work well if the PSU can’t source enough current. And so they’ve been able to get a look at several counterfeit iPhone chargers. This is not one of the recommended ways to power the RPi, but their ability to collect failed hardware means that they have identified three different fakes on the market.
Seen here is a genuine Apple product on the left. The others are fake, with the easiest way of spotting them being the shiny chrome plug connectors. The genuine part has a matte finish on the connectors. There is also a difference in the chamfering, and even a variation on the orientation of the USB port on some of them. Unfortunately we don’t get a look inside, which is what we really wanted. But you can see in the video after the break that weighing the adapter will also give it away as a fake, showing that the components within probably vary quite a bit. This reminds us of some other fake PSUs that have been exposed.
Continue reading “Raspberry Pi foundation looks at counterfeit Apple power supplies”