Make Your Own Headphone Bass Amp

Headphones rarely have much bass, and mobile devices rarely put out much power to those headphones anyway. If you're looking for a little more oomph from your mobile audio, Make shows off how to do just that. P

The build here is pretty complicated, but you'll be able to get all your parts easily. Once you're set, you'll need to some soldering and gluing to get your circuit working. From there, you'll just need to get the input/output box working, install some knobs, and you'll be set. It's by no means a beginner's project, but Make guides you through the steps very clearly, and the end result is better sounding music.

Bass Bump Headphone Amp | Make

Backseat USB charger

A lot of modern cars have a handy USB charger in the backseat so people in the back can keep their gadgets charged. Of course, older cars don't, which is why Instructables user wongman2001 decided to install his own.

The install here uses a cigarette adaptor and a few terminal connectors to wire in all the cables. The charger threads through the seat so it ends up looking clean and natural in the back when you're done. That also means you'll have to take the seat out to install this, but it doesn't look too difficult. Head over to Instructables for the full guide on how you can do it for yourself.

Backseat USB Charger

Sources: Lifehacker & HackADay

APP-etizers

ReachFast - Free! (For a limited time) : iPhone
It automatically pulls in all of the information from your Contacts app, so you won’t have to manually add them to get started. Then just tap on any contact to call them, double tap to FaceTime them, and swipe left to right to message them. You’re also able to create favorites, search for contacts by name, and view recent contacts. The app includes a handful of sorting options, the ability to add new contacts, and the ability to dial out.

AbleConverter - Free! (For a limited time) : iPhone
AbleConverter is actually two apps in one: unit converter and note taker. Youre able to quickly convert units of almost any kind, including currency, and then save your results as notes. The notes can be synced with your Evernote account as well, allowing them to be freely transferred between numerous devices. The app also includes copy and paste support, passcode protection, favorites, conversion history, and real time currency exchange rates for 34 countries.

Blocks! - Free! (For a limited time) : Universal
It allows you to build block-based structures in an interactive 3-D environment. Choose from 49 block shapes and an endless array of colors, and then just tap where you want them to go. Youre able to have four separate blocks available at all times. When youre finished building you can save or share your structure, or you can knock it down and start all over. The app also includes the ability to save and load boards, AirPrint support, undo and redo, and a grid view.

Bitless - Free! : Universal
You get to play as a little yellow cyclops block who is trying to evade the Bitless. Youre little block will scoot ahead on its own, but its up to you to tap to hop over gaps and obstacles. If you ram into a wall, your block will simply turn around and head the other way. You must use this to your advantage to complete all 50 levels. Oh, and theres wall jumping. Lots of wall jumping! The game also includes 
four worlds, three bosses to conquer, and achievements and leaderboards via Game Center.