RADIO Crystal Set (The early days)

This WebPage you are watching now was separated out of the main Radio page because the page has been heavy for my PC's environment.

EXPERIMENTS / RESULTS / PHOTOS
1st(4th) Crystal set 1st(4th) beginning/return
1st(4th) schematic
2nd Crystal set 2nd doubler
2nd schematic
3rd Crystal set 3rd unique
3rd schematic
5th Crystal set 5th reopen project
5th schematic
6th Crystal set 6th stock has run low
6th schematic

Denki-Manga

Coil & CapacitorLearn 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.

TuningYou 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.

Detection & shuntingSelected 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.
modulation

Antenna & Ground(Earth)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!!

crystal set circuitMost 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.

I can't stand!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).


Easiest one
 
Easiest one schematic

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.


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