Yep, the story is everywhere right now. Tupac performed at Coachella from beyond the grave in the form of a “hologram”. Most of you probably recognize what is going on pretty quickly though. This is the same Pepper’s Ghost trick we’ve seen several times already in concert performances from various virtual bands like the Gorillaz.
While reading this article explaining Pepper’s Ghost to the masses, we saw that they had found a true gem of a hack! [Kevin] was inspired by a trip to disney’s haunted mansion back in 2007. He came home and went to work building his own really cool back yard attraction that happened to include the same trick they are now using for imaginary performers. There are tons of pictures of the build and some nice notes along the way covering 2 years of operation and upgrades. It is an ancient trick, but we always love seeing a good build.
Reddit user [davvik] made an album to show off his custom all aluminum longboard. The whole setup weighs about 12lbs, which is not exactly light for a board. In spite of the added weight [davvik] comments that it is actually pretty responsive. The design is not uncommon but seems to have opted out of the speed holes in favor of structural rigidity, and frankly we love it.
We might not risk wearing sandals on the thing, but [davvik] says for the most part the whole setup has the feel of a wooden longboard, and the added weight makes it fun downhill. Future plans for the board include machining out the ends, we think this would be a great opportunity for some DIY anodizing!
Over the past few months, [Magnetovore] has been working on his magnetic cell project. It’s a very interesting instrument that seems right out of the electronic music explosion of the 1970s. Now, he’s ready to share his invention with the world, and we wouldn’t be surprised if we see this instrument being picked up by a few avant-garde musicians in the next few years.
Last September, we were introduced to [Magnetovore]’s magnetic cello. The original version used four ribbon sensors for each of the strings and had completely analog electronics, leaving us wondering why this cello wasn’t invented in the 70s. The new version of the cello keeps the analog electronics that sound remarkably like a real acoustic cello, but does away with three of the ribbon sensors. Now the cello has a single ribbon sensor being used as all four strings – to change which string is played, the musician just has to press a button on the ‘bow’.
There is a drawback to using only one ribbon sensor; it’s now impossible to play two strings simultaneously as on an acoustic cello. The electronics in [Magnetovore]’s original magnetic cello were monophonic anyway, so we’ll chalk this design change-up to reducing component cost.
After the break, you can check out a trio of very talented cellists playing [Magnetovore]’s magnetic cello. There’s the classic Pokemon Center theme, the Mario Bros. theme, as well a Bach minuet and a crazy improvisation showing off what the magnetic cello can do.
Continue reading “A new and improved magnetic cello”
[linux-works] picked up an old power supply from eBay, and as it was built back in the 60’s or 70’s, it was in need of a little TLC. One thing that immediately caught his eye was the condition of the knobs, dials, and banana plug receptacles – they were dull and faded, showing off 40+ years of heavy usage.
He started off by simply removing the knobs from the power supply, giving them a thorough cleaning with soapy water before leaving them to air dry. They didn’t look any better afterward, so he decided to take a different approach and apply some triple antibiotic ointment to the knobs. As it turns out, letting the ointment sit for a few minutes then wiping the knobs with a soft cloth really made them shine, as you can see in the image above. [linux-works] attributes the effect to the white petrolatum base of the product rather than the antibiotics, likely making a wide array of products equally suitable for the job.
We know how well Retr0bright has worked for the vintage computer folks, so we’ll be interested to see how long the effects of the triple antibiotic treatment last. It certainly can’t hurt those readers who spend their time perusing flea markets in search of classic electronic equipment.
[Nate] over at Sparkfun put up a great tutorial for using the SPOT personal satellite communicator with just about any microcontroller. These personal satellite transmitters were originally intended to pair with the bluetooth module of a smart phone, allowing you to send a short 41-character message from anywhere in the world. Now, you can use these neat little boxes for getting data from remote sensors, or even telemetry from a weather balloon.
[Nate]’s teardown expands on [natrium42/a>] and [Travis Goodspeed]’s efforts in reverse-engineering the SPOT satellite communicator. The hardware works with the Globalstar satellite constellation only for uplink use. That is, you can’t send stuff to a remote device with a SPOT. After poking around the circuitry of the original, first-edition SPOT, [Nate] pulled out a much cheaper SPOT Connect from his bag of tricks. Like the previous hacks, tying into the bluetooth TX/RX lines granted [Nate] full access to broadcast anything he wants to a satellite sitting in orbit.
We’ve seen the SPOT satellite messaging service put to use in a high altitude balloon over the wilds of northern California where it proved to be a very reliable, if expensive, means of data collection. Sometimes, though, XBees and terrestrial radio just aren’t good enough, and you need a satellite solution.
The SPOT satellite service has an enormous coverage area, seen in the title pic of this post. The only major landmasses not covered are eastern and southern Africa, India, and the southern tip of South America. If anyone out there wants to build a transatlantic UAV, SPOT, and [Nate]’s awesome tutorial, are the tools to use.
Tip ‘o the hat to [MS3FGX] for sending this one in.