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  2. Drum Buddy - Wikipedia

    en.wikipedia.org/wiki/Drum_Buddy

    Its four voices – Space, Snare, Bass and Kick, are triggered by activating a photoelectric cell either intermittently or with an on/off DIP switch in combination with exposure to light. [1] The Drum Buddy is outfitted with a light fixture on a periscopic pipe fixed to its base. [2] The fixture's bulb can be controlled by means of a dimmer ...

  3. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    The switches may be arranged so that they are in the same orientation for off, and contrasting orientations for on. [1] A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This ...

  4. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

  5. 50 Times Cheap Fixes Had A Major Impact On Home Life - AOL

    www.aol.com/55-people-share-relatively-cheap...

    Adding 4 recessed lights on a dimmer switch is under $200/room and is such a quality of life improvement, it's a no brainer. An honorable mention - sheds can be nice as they free up a ton of space ...

  6. Dimmer - Wikipedia

    en.wikipedia.org/wiki/Dimmer

    When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...

  7. TRIAC - Wikipedia

    en.wikipedia.org/wiki/TRIAC

    The gate current makes an equivalent NPN transistor switch on, which in turn draws current from the base of an equivalent PNP transistor, turning it on also. Part of the gate current (dotted line) is lost through the ohmic path across the p-silicon, flowing directly into MT1 without passing through the NPN transistor base.

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