Thyristor e headphones: o que têm em comum

1. Passo 1. Thyristor — evoluiu de — Diodo. A controllable counterpart of the diode with a four-layer structure.
2. Passo 2. Diodo — evoluiu de — Vacuum tube. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
3. Passo 3. Vacuum tube — inclui — Magnetron. An electron vacuum device.
4. Passo 4. Magnetron — tem como parte — Permanent magnet. A magnet makes the electrons spiral.
5. Passo 5. Permanent magnet — faz parte de — Headphones. A magnet moves the diaphragm.

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