Weekend Projects - Bottle Radio

Complete instructions for this episode of Weekend Projects can be found at
http://makeprojects.com/Project/Bottl...

Crystal radio technology has been around for many years. This "bottle radio" take on a crystal radio requires no power source, operates on the power from radio waves, and receives signal from a long wire antenna. As radio stations slowly move away from the AM band, the "window of opportunity" to experience this remarkable technology is dwindling. The "crystal" in question is contained inside a germanium diode, and is used to rectify the radio signal so that our ears can hear it.

• Category

  Science & Technology

[JDG622]

You guys could start a new world if one ends.

[HEadshot00001234]

So basically it's like the foxhole radio you uploaded WAAAYYY back when...dam...I remember that hitting my subscribers box and not list!

[hndrmrtz]

brilliant

[seryouf1]

please the software used for montage :)

[108adams]

My grandpa did one in Poland during WWII to listen to London Radio. It was extremely dangerous: if Germans had found the radio, he would have been killed in place.

[nurdsmart]

i love make! <3

[SATANICDRIFTER]

pretty cool

[ptown9000]

This will be great for the Zombie Apocalypse 

[Sneighke]

@Druid

The reason it must br grounded is because all radio transmitter antennas create an electrical circuit. The antenna uses current to create an RF wave. The antenna in your radio converts the RF wave back into a current. In order for it to work, all the current, as miniscule as it is, must be able to travel back to the transmitter. This path is via the physical ground, hence the name. Thus a complete circuit is created.

[kinsi55]

no, this one is using a bottle, not toilet paper roll

[fugu08]

Very clear instruction! Now I just have to find the time to make it. Thanks.

[sinuhesieda]

It looks like so called "fox hole" radio. Too bad it only uses AM (amplitude modulation), cause FM is the fácto in my state.