~TELEPHONE~

Antonio Meucci was the inventor of the "telettrófoni" that after was called telephone.
He built a telephone to connect his office with his bedroom because his wife was ill. In 1890 he has published the invent.

The telephone was upgraded with:
· Coal microphone
· Antilocal Luink dispositive
· Disc marker
· Tone marker
· Electric microphone

Funcionament 

The convencional telephone has two circuits: the conversation circuit that is the analogues part and the marking circuit that is responsable for the marking and the calls.

Evolution

In the past telephones were bigs and very heavies. They had a disc marker, but with the passing of the time they will upgraded and they had keyboards, they were lighter and smaller.
The boom was the appearing of the smartphones:

· It is a type of phone built on a mobile computing platform, with greater capacity to store data and perform activities. They have touch screen, radio, gallery, apps, camera, calculator, weather, contacts, calendar. Some examples of branchs of smartphones are: iPhones of Apple, Optimus of LG, Blackberry of Blackberry,Moto of Lenovo, Lumia of Nokia, Xperia of Sony, Galaxy of Samsung...

~RADIO~

The first precedents of the radio are from the end of the XIX century, with the invention of the voltaic battery by Alessandro Volta. Since them, the first telegraph started to be built and they advanced thanks to Samuel Morse's invention: The Morse Code. 

In 1876 it was discovered that sound could be listened through a cable but it was at the end of the XX century when they achieved the transmission of human voice, causing a big change.

Marconi's knowledge let the signals to spread for 20 km, a big achievement for that period and for the evolution of the radio.

In Latin America the radio arrived on august 27th, in 1920 in Buenos Aires. The first transmission was a Richard Wagner's Opera. In Mexico it was in 1930 with the first commentator: Arturo de Córdoba.

Nowardays everybody can listen to the radio because it is much more accesible.


The actual radios are more moderns andhave more channels that sometimes have a spokeperson. The most famous channels now in Spain are:

1. Cadena 100














2. Los 40















3. Europa FM