Rhine Tower clock Mk II
a special design, with a circuit board shaped like the tower
Published in issue 284, January 2000
The DCF-controlled LED clock design, published in the May 1998 issue of Elektor Electronics, is a radio-controlled electronic version of the clock mounted on the Rhine Tower in Düsseldorf. Inspired by the many positive reactions to this project, its designer has reworked the software to add new features. To make things even nicer, Elektor Electronics has designed a special circuit board in the shape of the actual tower in Düsseldorf.Building a circuit yourself is even more pleasant when the result is something unique. Those of you that have built the original DCF-controlled LED clock will certainly have experienced this first-hand. Anyone who sees such a clock for the first time will undoubtedly wonder what it is and how it works.The clock that is integrated into Düsseldorf’s Rhine Tower consists of a series of lights arranged in a vertical line. The 39 lamps that are used to indicate the time on the tower are replaced in this project by yellow LEDs.
Resistors: R1,R2 = 47kΩ R3=220Ω R4,R5,R7 = see text R6 =10kΩ R8 = 1kΩ8 R9 = 1kΩ R10 = 4kΩ7 Capacitors: C1 = 4µF7 63V radial C2 = 4-22 pF trimmer C3,C4 = 47pF C5,C6,C7 = 100nF C8 = 1000µF 25V C9 = 10µF 25V radial Semiconductors: D1,D46,D47,D48 = LED, high eff., green D2-D40,D56 = LED, high eff., yellow D41-D45,D50-D55 = LED, high eff., red D49 = 1N4001 T1 = BC557B IC1 = AT89C2051-12PC (order code 996519-1) IC2 = ICM7218A IJI IC3 = 7805 Miscellaneous: JP1 = 2-way jumper K1,K2 = 20-way boxheader Two 20-way sockets and a piece of flatcable S1,S2,S3 = pushbutton ,type ‘Digitast’ with integral LED (ITT Schadow) X1 = 12 MHz quartz crystal Bz1 = dc buzzer, 5 or 6 V Heatsink for IC3 (15 K/W, e.g., ICK35) PCB, order code 990076-1 Optional: DCF-module (Conrad Electronics order code 64 11 38-55)
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Click below to download a PDF copy of this article from Elektor magazine.
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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