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Home » Publications » Industry magazines » Engineering magazines » EDN Asia » November 2004 »
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    MLA

    Williams, Jim. "Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement)." EDN Asia. Canon Communications L.L.C. 2004. HighBeam Research. 21 Apr. 2018 <https://www.highbeam.com>.

    Chicago

    Williams, Jim. "Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement)." EDN Asia. 2004. HighBeam Research. (April 21, 2018). https://www.highbeam.com/doc/1G1-125568007.html

    APA

    Williams, Jim. "Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement)." EDN Asia. Canon Communications L.L.C. 2004. Retrieved April 21, 2018 from HighBeam Research: https://www.highbeam.com/doc/1G1-125568007.html

    Please use HighBeam citations as a starting point only. Not all required citation information is available for every article, and citation requirements change over time.

Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement)

EDN Asia
EDN Asia

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November 1, 2004 | Williams, Jim | Copyright
COPYRIGHT 2009 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights or concerns about this content should be directed to Customer Service.
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    <a href="https://www.highbeam.com/doc/1G1-125568007.html" title="Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement) | HighBeam Research">Basic flashlamp illumination circuitry for cellular telephones/cameras--design note 345.(Advertisement)</a>

Introduction

Next generation cellular telephones will include high quality photographic capability. Flashlamp-based lighting is crucial for good photographic performance. A previous full-length Linear Technology publication detailed flash illumination issues and presented flash circuitry equipped with "red-eye" reduction capability. (1,2) Some applications do not require this feature; deleting it results in an extremely simple and compact flashlamp solution.

Flashlamp Circuitry

Figure 1's circuit consists of a power converter, flashlamp, storage capacitor and an SCR-based trigger. In operation the LT[R]3468-1 charges C1 to a regulated 300V at about 80% efficiency. …


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