I pulled up my camera to take a couple of shots when I felt it chirp in my hand. Text message received! I could hear a few other phones around me making noise as well. I don’t recall how many ...

This diagram shows the standard layout of transistors in cell phone power amplifiers, at left, and a new highly efficient amplifier design, at right. The new design could help make possible ...

In order to help his friend prepare for a talk at DEFCON this weekend, [Craig] built an IR photodiode amplifier circuit. The circuit extended the detection range of the hack from a few inches to a … ...

We haven’t heard of anyone making a tin can phone amplifier, but the strictly passive route wasn’t working, so an op-amp does some messy boosting.

‘Tea’ measures just 7.95mm at its thickest point, which means it can still comfortably slip into your pocket even when magnetically attached to your smartphone. Tea phone headphone amplifier ...

The mik Sound Case is a new type of phone case available for the iPhone 4/4S and iPhone 5/5s. It amplifies the phone’s speaker by an additional 15 to 20 decibels and improves the clarity and ...

If you'd rather keep your budget to under $1, you can make your own amplifier out of a plastic cup and two bobby pins. In addition to the cup and pins you'll also need a razor blade (or Xacto ...

You also don't get a phone cradle or recharging option, which means that if you've only got one cigarette socket you'll have to choose between boosting and recharging your handset.