Thyristor and headphones: what they have in common

1. Step 1. Thyristor — evolved from — Diode. A controllable counterpart of the diode with a four-layer structure.
2. Step 2. Diode — evolved from — Vacuum tube. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
3. Step 3. Vacuum tube — includes — Magnetron. An electron vacuum device.
4. Step 4. Magnetron — has part — Permanent magnet. A magnet makes the electrons spiral.
5. Step 5. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.

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