Tag "nerdy"
Salt Water Powers Radio (Aug, 1962)

If you build one of these, you too could be this cool.

Salt Water Powers Radio

Battery made of scrap metal and a pill vial runs for months!


THE salt-water cell powering this transistor radio has all the advantages of a dry cell, costs only pennies to make, and lasts for months. The complete radio receiver, with battery but less earphones, can be built for $3 or less.

As shown in the photos, the battery delivers about three-tenths of a volt. The radio consumes only 12 microamps while running, and in actual tests ran three days continuously without any detectable dip in volume.