My 8 year old and I are trying to figure out how to get this crystal radio we made working. It's based off this youtube video. We get clicks when we put the crystal ear piece either side of the resistor but nothing more yet.
My son tried a really long aerial, wire winding all around the house, and for ground he had a wire hooked to a bolt pushed into a pot with dirt. (However I'm not sure whether we actually tried both these at the same time!)
Why does it need a ground, and will it work without one?
How long does the aerial need to be?
Does the covered copper coil need to be thinner wire? Whats the relationship between the wire size and amount of turnings, and the length of arial needed? We have about 200 windings.
Would be great to understand this a little bit more and actually get it working.
Here's some photos: