RADIO Crystal Set (The early days)

Denki-Manga

Learn how to make Crystal(Xtal) set in Manga.
"Denki" means "Electricity, Electric". Crystal set is the fundamental of Electric. So you have to learn it.
Crystal set = Radio receives electric-waves of broadcasting, and gets sounds, voices, some music, soso.
It makes electric power from the waves with a Coil.
The electric power is accumulated into a Capacitor. With reciprocal action of them, you can get some (weak) electric current.

You want to pick a broadcasting station up. Called "Tuning". You take tuning with a Coil and a Capacitor.
With reciprocal action of them, you go to tune the receiving frequency you want to listen.

S.F.[Hz] = Selected Frequency
L[H] = capacity of Coil
C[F] = capacity of Capacitor
Sq. = Square root
PI = 3.14159265.....

S.F. = 1 / Sq.( 2 * PI * L * C )

You ajust one of both of Coil or Capacitor to take tuning in.

Selected Electric-Wave (electric current) is very high frequency which you can't listen as sounds.
You take Detection it and it come into change sounds you can listen.
Some of Remains(nuisances : removed high frequency waves you can not listen in sounds you require to listen) go to be abandoned to Ground.

A country of Japan we live in is very small. We can not build a large antenna. So we often use Electric wires (power lines).
To keep away from electric-shock, we (and you) have to use a very small Capacitor for it.
Very small Capacitor(appox. 100pF) takes through high frequency current, but does not take through other ones.
SAFETY FIRST!!

Most European, American & Australian can have a large antenna in the large garden easily probably. (←a prejudice)
They can put Selectivity above sensitivity. So, they can build them crystal sets like this.
Because they can use crystal radios kind of this.
And large antenna supplements great electric waves that have enough power for great sensitivity.

And the Ground(Earth) is also an important.
I thought that so, and I drew a picture about that so.
And the piece of work I did has been become a thing which you can not admire. I regret that.
Connect to metal water pipes, a metal table, or some metal goods.
You connect it to just a long wire, and maybe that will produce a better result.
Or touch the Ground point with your own finger, but you do not take that under nasty weather (with thunders).

The Easiest Crystal Set Find a FerriteBar which is used in RadioTuner to tune, and wrap it in a sheet of paper. Wind Enameled wire, about 120 turns, and set few necessary parts, so the end of constructions. Someone said that, a MagnetBar becomes a substitute for a FerriteBar ??? You cannot find a GermaniumDiode? Pickle a safety razor blade with a pencil read, as the purpose of a Diode.