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  2. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

  3. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    The most widely used form is the interrupter bell, which is a mechanical bell that produces a continuous sound when current is applied. See animation, above. The bell or gong (B), which is often in the shape of a cup or half-sphere, is struck by a spring-loaded arm (A) with a metal ball on the end called a clapper, actuated by an electromagnet ...

  4. Friedland 1807 - Wikipedia

    en.wikipedia.org/wiki/Friedland_1807

    In addition, Friedland 1807 also adds rules for headquarters command, morale, reserves and artillery. [2] The game's Combat Results Table (CRT) uses a roll of two six-sided dice resulting in a bell curve of results, instead of the linear results produced by the single six-sided die used by most wargames of the time. The battles lasts from 8 a.m ...

  5. Transformer types - Wikipedia

    en.wikipedia.org/wiki/Transformer_types

    A planar transformer Exploded view: the spiral primary "winding" on one side of the PCB (the spiral secondary "winding" is on the other side of the PCB) Manufacturers either use flat copper sheets or etch spiral patterns on a printed circuit board to form the "windings" of a planar transformer, replacing the turns of wire used to make other ...

  6. French brig Friedland (1807) - Wikipedia

    en.wikipedia.org/wiki/French_brig_Friedland_(1807)

    Friedland initially bore the name Illyrien, but had her name changed to Vendicare in early 1807. [1] Then she received a second name change, to Friedland, after launch, [1] to commemorate the Emperor Napoleon's victory on 14 June at the battle of Friedland. Friedland was at Ancona in December 1807, and at Corfu between 1807 and 1808. She is ...

  7. Flyback transformer - Wikipedia

    en.wikipedia.org/wiki/Flyback_transformer

    An old style flyback transformer producing an arc Modern CRT television flyback transformer with integral tripler. A flyback transformer (FBT), also called a line output transformer (LOPT), is a special type of electrical transformer. It was initially designed to generate high-voltage sawtooth signals at a relatively high frequency.