We’re not above a good practical joke here at Lifehacker, and today’s electronics-based prank is a great one. Fire up the soldering gun and get ready to annoy with a vengeance.
The beeping thing is a simple circuit board powered by a 9-volt battery and outputting a high-pitched whining sound through a tiny speaker. The pictures above show it hidden in a gutted power transformer, but you could just as easily hide it in anything else big enough to conceal the device. Check the video below to see the construction process and hear it in action.
Have a great prank of your own, electronic or otherwise? Let’s hear about it in the comments.