Power supply and modem: what they have in common

1. Step 1. Power supply — is part of — Hi-fi amplifier. A transformer power supply.
2. Step 2. Hi-fi amplifier — is a kind of — Amplifier. An amplifier.
3. Step 3. Amplifier — is part of — Hearing aid. An amplifier.
4. Step 4. Hearing aid — evolved from — Telephone. The first electric hearing aids were built from telephone components.
5. Step 5. Telephone — is used in — Modem. It works over a telephone line.

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