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  2. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    Older electric doorbell. An electric bell is a mechanical or electronic bell that functions by means of an electromagnet.When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.

  3. Boost converter - Wikipedia

    en.wikipedia.org/wiki/Boost_converter

    Low-cost converter modules: two buck and one boost. Boost converter from a TI calculator, generating 9 V from 2.4 V provided by two AA rechargeable cells.. A boost converter or step-up converter is a DC-to-DC converter that increases voltage, while decreasing current, from its input to its output ().

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