Operational amplifier e fole: o que têm em comum

1. Passo 1. Operational amplifier — tem como parte — Vacuum tube. The first op-amps used vacuum tubes.
2. Passo 2. Vacuum tube — faz parte de — ENIAC. ENIAC contained about 18,000 vacuum tubes.
3. Passo 3. ENIAC — utiliza — Punched card. ENIAC’s input and output went through IBM punched-card equipment.
4. Passo 4. Punched card — funciona como — Pinned cylinder. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
5. Passo 5. Pinned cylinder — faz parte de — Realejo. A pinned cylinder sets the tune.
6. Passo 6. Realejo — tem como parte — Fole. Bellows feed air into the pipes.

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