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  2. Bootable business card - Wikipedia

    en.wikipedia.org/wiki/Bootable_business_card

    A bootable business card ( BBC) is a CD-ROM that has been cut, pressed, or molded to the size and shape of a business card (designed to fit in a wallet or pocket). Alternative names for this form factor include "credit card", "hockey rink", and " wallet -size". The cards are designed to hold about 50 MB. The CD-ROM business cards are generally ...

  3. Punched card - Wikipedia

    en.wikipedia.org/wiki/Punched_card

    Punched card. A 12-row/80-column IBM punched card from the mid-twentieth century. A punched card (also punch card [1] or punched-card [2]) is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines . Punched cards were widely used in the 20th ...

  4. Smart card - Wikipedia

    en.wikipedia.org/wiki/Smart_card

    A smart card ( SC ), chip card, or integrated circuit card ( ICC or IC card ), is a card used to control access to a resource. It is typically a plastic credit card-sized card with an embedded integrated circuit (IC) chip. [1] Many smart cards include a pattern of metal contacts to electrically connect to the internal chip.

  5. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    The flat bottom surfaces of the anvil and post embedded inside the epoxy act as anchors, to prevent the conductors from being forcefully pulled out via mechanical strain or vibration. A light-emitting diode ( LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron ...

  6. LED circuit - Wikipedia

    en.wikipedia.org/wiki/LED_circuit

    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. The voltage drop across an LED is approximately constant over a wide range of operating ...

  7. Light-emitting diode physics - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode_physics

    A LED is a long-lived light source, but certain mechanisms can cause slow loss of efficiency of the device or sudden failure. The wavelength of the light emitted is a function of the band gap of the semiconductor material used; materials such as gallium arsenide , and others , with various trace doping elements , are used to produce different ...

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