Operational amplifier and bellows: what they have in common

1. Step 1. Operational amplifier — has part — Vacuum tube. The first op-amps used vacuum tubes.
2. Step 2. Vacuum tube — is part of — ENIAC. ENIAC contained about 18,000 vacuum tubes.
3. Step 3. ENIAC — uses — Punched card. ENIAC’s input and output went through IBM punched-card equipment.
4. Step 4. Punched card — works like — Pinned cylinder. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
5. Step 5. Pinned cylinder — is part of — Barrel organ. A pinned cylinder sets the tune.
6. Step 6. Barrel organ — has part — Bellows. Bellows feed air into the pipes.

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