Budget HAM radio proves you don't have to spend a lot of money to get reliable and durable ham radio equipment that will be a backup if cell phones fail! geekprepper.org
En skiss på min koppling av mikrofonen i boxen.
"Crystal Radio: A Science Kit for Student Electronics": Build a crystal radio and then tune in an AM radio station--without batteries. An improved crystal radio kit and an updated procedure makes this a great choice for an assigned #science project or just for hands-on #electronics fun! [Source: Science Buddies, http://www.sciencebuddies.org/blog/2014/03/crystal-radio-a-science-kit-for-student-electronics.php?from=Pinterest] #STEM #scienceproject #crystalradio
It’s portable. It’s affordable. And it costs less than your Bug Out Bag.