Electronics Circuits

The collection of many electronic circuits and electronic projects that easy to build with PCB layout for the hobbyist and study.

Rescue Portable USB Battery Pack

Charge of the battery brigade Just as coders always say they "don't anticipate any problems" before each release (would they release the code if they did anticipate problems?), we never think we're going to run out of juice on our smartphones or tablets until it happens. A conference call runs long. We're unexpectedly away from an outlet all day. Something we *thought* was plugged in, it turns out wasn't. These aren't the sorts of situations where we bring along the charger, because we didn't anticipate needing it.

Rescue Portable USB Battery Pack

Bring along some reinforcements in the form of these Rescue Portable USB Battery Packs. With a rugged design and integrated cover, they allow you to charge your device and the internal battery at the same time if you've planned ahead. And if you're surprised, like we generally are, they'll give you either 3 or 10 more hours of talk time on your smartphone, depending on the model you pick. You can stow the 1350mAh version in your pocket, and the 7000mAh version is especially good at giving your iPad or tablet more life. Keep one with you for those unexpected moments. [Via]

LED Alarm Clock will Charge your Phone at Night

As time goes on, the devices around us get more and more complicated. Our phones can perform hundreds of tasks, our mice want to do more than just move the cursor on the screen, and even our clocks aren’t just limited to displaying the time, and waking us up in the morning. But sometimes you don’t need all of the bells-and-whistles.

Sure, this LED Alarm Clock with USB Outlet has one extra function, but it’s a pretty useful one. Usually we have to have a special dock for our phone, or just plug it into the wall, when we want to charge it overnight. However, this simple clock gives you the opportunity to charge any USB device without tying up another outlet.

LED Alarm Clock will Charge your Phone at Night

The clock is about as basic as they come. The digits are displayed in red LEDs, and you can set an alarm to get you out of bed. If the power goes out, the three AA batteries (not included) will keep it going, so that you don’t miss work in the morning. Finally, the two USB ports can be used to charge phones, tablets, and anything else you need. The $78 price does seem a bit steep, since it only adds the one function to an otherwise ordinary clock.

BlackBerry 9720 Smartphone Announced

BlackBerry has announced its latest smartphone – BlackBerry 9720. If you’re curious, let’s go on checking what features have been equipped in the smartphone with QWERTY keyboard. BlackBerry 9720 is an entry level smartphone that measures 4.48 x 2.6 x 0.47 inches and weights 4.23 oz.
BlackBerry 9720 Smartphone Announced

As we can see from the images, the smartphone features sleek and compact design, and comes with a QWERTY keyboard plus 2.8-inch touch screen HVGA display with 480 x 360 pixels resolution in order to provide comfortable and convenient typing and operating experience. Moreover, BlackBerry 9720 runs on BlackBerry 7 OS version 7.1, and has an 806MHz Tavor MG1 processor, 512MB RAM, 512MB internal storage, and 5-megapixel rear camera with LED flash. Apart from that, other specs also include WiFi, Bluetooth 2.1 +EDR, GPS, microSD card slot and 1450mAh rechargeable battery.

Bungajungle Universal Stands for iPhone Tablets Laptops and Cameras

Want to conveniently use your iPhone, tablets, laptops or cameras? You may like to check Bungajungle, the universal stands should be able to meet your requirements. Bungajungle is a multi functional universal stand series that comes in four stands including Dundabunga, Sungabunga, Treebunga, and Ungabunga for different mobile devices such as iPad. iPhone, laptops, cameras, and etc.

Bungajungle Universal Stands for iPhone Tablets Laptops and Cameras

As we can see from the images, each universal stand from Bungajungle features a flexible arm in order that you can conveniently adjust the stand for optimal viewing position, while the neodymium rare earth magnet attachment system allows the stand steadily grip your mobile device, and you can also freely rotate it for different purposes.

Bungajungle Universal Stands for iPhone Tablets Laptops and Cameras

At present the inventor of Bungajungle is raising fund at Kickstarter. Pledging $30 will let you own a Dundabunga universal stand with a GoPro camera mount. If you’re interested, jump to Kickstarter official site for more details or check out the following demo video first.

How To Add New "Send To" Destination (Right Click) in Windows

When transferring files out of your computer in Windows 7 or 8, you will normally right click on the required file, then select the ‘Send to’ option. You can then send the file via Bluetooth, third-party services like Dropbox or Evernote among a few other destinations. However, some of these destinations may not be what you need or even use at all. Wouldn’t it prefer to customize these destinations as you like?

How To Add New "Send To" Destination (Right Click) in Windows

Follow these steps:


With a little tweak in Windows operating system you can add more locations to ‘Send to’ without the need of any external softwares.

1: To add more locations to the ‘Send to’ menu, search for ‘Run’ from the Windows Start Menu.


2: In the box that pops up, type ‘shell:sendto’ and press Enter.


3: You will arrive at a folder where you can add in your choice of destinations. To add, just drag and drop the location icon or copy and paste the shortcut of the destination you want.


4: Check to see if your destination as been added, just right-click on any file and hover over ‘Send to’.


You can insert as many destinations as needed under the ‘Send to’ option.

Google Announces Samsung Galaxy S4 with 'stock' Android, coming in June for $649

Inline with earlier rumours, Google announced a variant of the Samsung Galaxy S4 that runs stock Android at the Google I/O event in San Francisco. Google will be selling the phone bootloader and SIM unlocked on Google Play Store at a price of $649 (Rs. 35,500 approximately) before taxes and shipping starting June 26. Since the phone is SIM unlocked, it should work on GSM operators across the globe.

Bootloader unlocked means the users are free to install any custom Android ROM on the phone, or, theoretically at least, any other OS on their phone altogether. As mentioned earlier, the phone runs 'stock' Android, which means it is free from any third-party skins or software and provides the Android experience as Google intended. Google also confirmed that the phone will receive updates directly from Google, just like the Nexus phones.

Google announces Samsung Galaxy S4 with 'stock' Android, coming in June for $649

As of now, Google has announced plans to sell the phone only in the US and plans to launch the phone in other countries remain unclear. The phone targets users and developers who prefer the stock version of Android over the version that adds Samsung's TouchWiz user interface layer. We're not sure if many are fans of Samsung's TouchWiz UI, that has been panned for employing big, glossy and cartoon-like icons and menus.

So the phone might find favour among Android enthusiasts who'd like to have all the power that the Galaxy S4 carries under the hood along with the simplicity of stock Android. We wonder what will happen to Samsung's custom apps, motion and hand gestures, and camera features such as dual-shot, employing the use of both front and back camera, eraser shot mode to remove people from photos, and a Cinemagram like feature called Cinema Photo.

The phone's apps also make use of its several hardware sensors including temperature and humidity sensors. It will be interesting to see if Samsung has deployed additional apps and software to offer the same functionality or totally get rid of it.

How to Make a Vibrobot

A vibrobot is perhaps one of the quickest and easiest bots that you can build. In almost no time you can make a fun little bot that makes its ways to and fro across the floor. It is so easy, in fact, that it wouldn't be hard to make a few at once. And then, you can have your own mini private army of vibrobots to do your bidding (assuming that your bidding is to have a bunch of tiny little bots moving randomly to and fro).
How to Make a Vibrobot

You will need

Step 1: Go get stuff


How to Make a Vibrobot

Step 2: Solder


How to Make a Vibrobot
Trim the wire leads of the vibrating motor shorter. Strip away a bit of the protective jacket to expose the copper wires. Solder the red wire of the 2032 battery holder to the positive pin of the battery holder. Solder the black wire to the ground (minus) pin of the battery holder.

Step 3: Hot glue


How to Make a Vibrobot
Use your diagonal cutters to cut the toothbrush head from the toothbrush handle. Hot glue the motor and battery holder to the flat plastic part of the the toothbrush head.

Step 4: Power it up!


How to Make a Vibrobot

Insert the 2032 battery and watch it go.