Create a focused speaker so your music targets only the listener. That demodulates at 40 kilohertz, with an H-bridge and ...

[Jens] decided he wanted to try building his own laser cutter to see just how much you can actually cut with a fairly low power 300mW laser diode. He was inspired by a similar project from earlier ...

I’m not a smoker, and I don’t carry a lighter around in case anyone needs a light. However, I could totally see myself with a miniature laser lighter. In fact, if you want to build one, feel free to ...

This just may be the coolest way to eavesdrop on a conversation. You can now build your own Clear-and-Present-Danger-esque laser microphone using inexpensive materials: By reflecting any type of laser ...