How Radio can be generated using minimum instruments that is parts?

Answer 1

-- Construct an antenna. Hang a long piece of wire outside between any

two convenient supports, such as the house, the garage, trees, etc. Bring

one end of the wire inside.

-- Wind a great length of fine, insulated wire around a pencil. Connect one

end of the coil to the inside end of the antenna. Connect the other end of

the coil to a cold-water pipe.

-- Connect one end of a small germanium diode to the point where the coil

and the antenna join.

-- Connect one end of an earphone or a pair of ear-buds to a cold-water pipe.

-- Connect the free end of the earphone to the free end of the diode.

If you happen to have wound the right amount of wire onto the pencil, then

you'll hear the nearest 2 or 3 local AM radio stations faintly in the earphone.

If you hear nothing, then it's likely that you stopped winding the coil too soon.

That's an AM radio . . . 1 antenna, 1 inductor (coil), 1 diode, 1 earphone.

All the rest is commentary and enhancements.

For example:

You want to be able to pick out one station at a time ?

You want to hear more than just the few strongest stations in town ?

You want to play them through a loudspeaker ?

You want a built-in antenna ?

You want FM too ?

You want a picture to go along with the sound ?

You want to use it to pick up GPS and make phone calls too ?

Those are all easy enough, but you'll have to use more parts.