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2. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.

3. Holiday lighting technology - Wikipedia

   en.wikipedia.org/wiki/Holiday_lighting_technology

   Holiday lighting technology has been subject to considerable development and variation since the replacement of candles by electric lights. [ citation needed ] While originally used during the Christmas holidays as Christmas lights , modern electric light arrays have become popular around the world in many cultures and are used both during ...

4. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   Diode (all types, including LED), thyristor "D" is preferred for various types of diodes DL: Delay line: DN: Diode network: may be simplified to "D" for diode DS: Display, general light source, lamp, signal light: F: Fuse: FB: Ferrite bead: sometimes changed to "L" for inductor, though "E" was used in the currently inactive standard IEEE 315 ...

5. Voltage regulator - Wikipedia

   en.wikipedia.org/wiki/Voltage_regulator

   The ferroresonant transformer, ferroresonant regulator or constant-voltage transformer is a type of saturating transformer used as a voltage regulator. These transformers use a tank circuit composed of a high-voltage resonant winding and a capacitor to produce a nearly constant average output voltage with a varying input current or varying load.

6. Electrical ballast - Wikipedia

   en.wikipedia.org/wiki/Electrical_ballast

   A commonly used light in the home in the 1960s in 220–240 V countries was a circular tube ballasted by an under-run regular mains filament lamp. Self ballasted mercury-vapor lamps incorporate ordinary tungsten filaments within the overall envelope of the lamp to act as the ballast, and to partially compensate for the red-deficient light ...

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!