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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Inline Clock Uses Incandescent Display

David Christianson's inline clock has an electromechanical incandescent display based on an arrayof tiny projectors sharing a ground glass rear projection plane - RF CafeHere is a different type of digital clock that uses a single digit to read out the time serially; i.e., if it the new time is 3:51, the clock first displays a 3, then a second or so later displays a 5, then finally a 1. Obviously it cannot update the time every second, but that is not what this kind of timepiece is meant for. It is purely a conversation piece. What makes this clock, designed and built by David Christianson, is its electromechanical incandescent display. "The displays make use of a small piece of film and 12 lens systems to project whatever of 12 images you want to provide." Reportedly, this method was devised in the 1960s and was very expensive even back then - about $100 per digit. No info is provided about the exact display used, but it seems any 7-segment display type can be adapted, even a cheap LED.

Inline Clock Uses Incandescent Display - RF Cafe

Posted  February 2013