In just a few hours you can make a completely batteryless AM radio receiver with a range of around 25 miles. Built with a small assortment of components, some scrap wood, and a beverage bottle tightly wound with magnet wire, we call this project Bottle Radio. Similar to other “crystal radio” projects, the crystal in…
MAKE presents: The TransistorWatch this video on YouTube Video by MAKE They electronically switch and amplify signals by harnessing the unique abilities of semiconductor materials. Their invention has transformed the world of electronics and accelerated our entry into the digital age. Behold – the Transistor! brought to you by makezine.com audio and video by Collin…
Description: Commercial Geiger counters can cost hundreds of dollars. With this Geiger Counter Kit you can build your own at a fraction of the price! This easy to solder kit can be built in an evening and it works just like you think it would; clicking and blinking in the presence of radiation. Is grandma’s…
As Kent was riding home one night, he wondered why his bike’s headlight, meant to illuminate the road ahead of him, was mounted on the handlebars. Why couldn’t the light be closer to the ground? He put his engineering mind to work, and Revolights were born. The Revolights bike lighting system consists of two narrow…
Demo of the Mark Rodgers (KC8GRQ) Twitter to Pager setup. This uses a POCSAG pager on the Ham Radio bands to send specific tweets from his account. Details