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by Marshall Brain

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Brain, Marshall.  "How Digital Clocks Work"  01 April 2000.  HowStuffWorks.com. <http://electronics.howstuffworks.com/gadgets/clocks-watches/digital-clock.htm>  11 February 2012.
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Gadgets Deconstructed

Watch now
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Inside this Article
  1. Introduction to How Digital Clocks Work
  2. The Basics
  3. High-Level View
  1. Building Your Own Digital Clock
  2. Circuit Diagram
  3. 7490 Pinout
  4. See more »
    1. Creating the Second Hand
    2. Displaying the Time as Numerals
    3. Lots More Information
    4. See all Clocks and Watches articles

Lots More Information

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Inside this Article
  1. Introduction to How Digital Clocks Work
  2. The Basics
  3. High-Level View
  4. Building Your Own Digital Clock
  5. Circuit Diagram
  1. 7490 Pinout
  2. Creating the Second Hand
  3. Displaying the Time as Numerals
  4. Lots More Information
  5. See all Clocks and Watches articles
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Prices: Clock Radios

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    Digital AM/FM Dual Alarm Clock Radio/CD Player Digital clock with large 4-digit LED

    Coby? CDRA147 Digital AM/FM Dual Alarm Clock Radio/CD Player has high-contrast accents and contemporary styling giving a new look to the traditional alarm clock. This digital clock radio features a full-range stereo system, built-in AM/FM radio and multifunctional dual alarm with snooze/sleep timers. Integrated 3.5mm line-in jack allows for easy connection to your portable MP3 or CD player.

    $70.30

  • iLive IC2807 Travel Speaker and Alarm Clock with Remote Control, Carrying Bag, and iPod Dock (Black)
    iLive IC2807 Travel Speaker and Alarm Clock with Remote Control, Carrying Bag, and iPod Dock (Black)

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    Manufacturer: iHomeManufacturer Part Number: iP16GVCManufacturer Website Address: Brand Name: iHomeProduct Model: iP16GVCProduct Name: iP16GVC Clock RadioProduct Type: Clock RadioNumber of Speakers: 2Speaker Form Factor: IntegratedScreen Type: LCDAudio Line In: YesBuilt-in Devices: iPod DockBuilt-in Devices: iPhone DockNumber of Batteries Support: 4Battery Size Support: AAInput Voltage: 110 V ACInput Voltage: 220 V ACColor: Gun MetalMaterial: AluminumForm Factor: Desktop

    $78.67

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