Charge Your Gadgets Anywhere With This Pocket-Sized Folding Solar Panel

Solar Cru, YouTube
Solar Cru, YouTube

Portable power banks are great for charging your phone when you’re out and about all day, but even they need to be charged via an electrical outlet. There's only so much a power bank can do when you’re out hiking the Appalachian Trail or roughing it in the woods during a camping trip.

Enter the SolarCru—a lightweight, foldable solar panel now available on Kickstarter. It charges your phone and other electronic devices just by soaking up the sunshine. Strap it to your backpack or drape it over your tent to let the solar panel’s external battery charge during the day. Then, right before you go to bed, you can plug your electronic device into the panel's USB port to let it charge overnight.

It's capable of charging a tablet, GPS, speaker, headphones, camera, or other small wattage devices. “A built-in intelligent chip identifies each device plugged in and automatically adjusts the energy output to provide the right amount of power,” according to the SolarCru Kickstarter page.

A single panel is good “for small charging tasks,” according to the product page, but you can connect up to three panels together to nearly triple the electrical output. It takes roughly three hours and 45 minutes to charge a phone using a single panel, for instance, or about one hour if you’re using three panels at once. The amount of daylight time it takes to harvest enough energy for charging will depend on weather conditions, but it will still work on cloudy days, albeit more slowly.

The foldable panel weighs less than a pound and rolls up into a compact case that it can easily be tucked away in your backpack or jacket pocket. It’s also made from a scratch- and water-resistant material, so if you get rained out while camping, it won't destroy your only source of power.

You can pre-order a single SolarCru panel on Kickstarter for $34 (less than some power banks), or a pack of five for $145. Orders are scheduled to be delivered in March.

The Reason Why Your Car’s Turn Signal Makes a Clicking Sound

Zmaj88, iStock / Getty Images Plus
Zmaj88, iStock / Getty Images Plus

The clicking of a turn signal ranks among the least-annoying sounds a car can make. Along with the flashing bulb behind the arrow in your car's dashboard, the gentle, rhythmic tick tick tick-ing tones are a sign that your blinker is working properly when you switch it on. Even as technology has progressed, this feature has remained a constant throughout generations of vehicles—or at least that's how it appears to drivers. According to Jalopnik, there's one thing that has changed, though: the actual source of that familiar sound.

The flashing turn signals began appearing in automobiles in the late 1930s when Buick made them standard in some models. Traditionally, the clicking sound is made via heat. Drivers would switch on their blinker, and the electricity would heat up a bimetallic spring in the car, causing it to bend until it made contact with a small strip of metal. When these two components connected, a current would pass through them and power the electric turn signal lights. The bimetallic spring quickly cooled down and returned to its original form, turning off the light, before the whole process started again to create a new flash. As the spring bent back and forth, it created a clicking sound.

The next evolution of turn signals used a similar trick, but instead of moving a spring due to heat, it sent the electronic pulse to an electromagnet via a chip. When activated, the electromagnet pulled up a metal armature and disconnected the current powering the light (or the opposite, depending on the relay setup). Without the pulse from the chip, the electromagnet turned off and the armature returned to old position and bridged the circuit providing power to the bulbs. As was the case with the thermal spring, the relay clicked every time it moved.

Up until recently, this was how most car turn signals functioned, but things have changed as cars have become more computerized. Many car manufactured today rely on computer commands to activate their turn signals, skipping processes that once produced the distinctive clicks. But the clicking sounds are something people grew up with, and drivers might be unsettled if they heard nothing after activating their blinkers. That's why the mechanical sound still exists in the computer era—even though in many modern cars, it's actually just being broadcast through the vehicle's audio system.

For a visual of how electronic flasher signal systems work in cars, check out the video below.

[h/t Jalopnik]

Sony Is Celebrating the Walkman’s 40th Birthday With a Retrospective Exhibition in Tokyo

Joost J. Bakker, Wikimedia Commons // CC BY 2.0
Joost J. Bakker, Wikimedia Commons // CC BY 2.0

Before the dawn of CD players, mp3 players, and iTunes, cassette tape players dominated the music scene. The Walkman was the most prolific among them, and as designboom reports, Sony is hosting a retrospective to celebrate the 40th anniversary of the gadget's debut.

The Walkman first appeared in stores in Japan on July 1, 1979—just a few months after Sony cofounder Masaru Ibuka (who had already retired at that point) asked Sony executives to create a lightweight cassette player that would allow him to listen to music on long flights. The product was an instant hit, helping make cassette tapes more popular than vinyl and introducing many consumers to portable, personal devices for the first time.

Four decades later, the Walkman is no longer the hottest music technology on the market, but its impact on the industry is undeniable. Sony's new exhibit, titled "#009 WALKMAN IN THE PARK 40 Years Since the Day the Music Walked," explores that legacy. At Ginza Sony Park in Tokyo's Ginza district, visitors can experience the exhibit in two parts. The first is "My Story, My Walkman," which features the stories of 40 celebrities whose lives were changed by the Walkman. The second section is a "Walkman Wall" where about 230 models of the Walkman, from the original cassette players to CD and MP3 players, are on display.

The exhibit opened on July 1, the Walkman's anniversary, and will continue through September 1. Anyone can explore the Tokyo retrospective for free from 10 a.m. to 8 p.m.

[h/t designboom]

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