We appear to be entering a new golden age of electricity-free guitar amplification - earlier this year, we heard DelSonix's battery-less offering, and now Noggin Rockers hopes to provide a similar ...

Discover a creative way to amplify your smartphone's sound with this easy DIY project. Learn how to repurpose a stethoscope and plastic bottles to build a homemade phone speaker amplifier. Follow step ...

[Vik] sent in this simple little project. He purchased a $3 spy ear, a simple 3 transistor amplifier, and attached a stethoscope end. Little modification was necessary, mainly just scraping a bit more ...

This digital stethoscope calculates beats per minute and provides an alert if the rate falls out of a specified range while displaying the heartbeat on any television. The stethoscope is the first ...