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Tri-State Time

Quartz clock with a trinary display

Published in issue 386, February 2009

Inspired by a binary clock he saw at a mathematics museum the author of this design went one step further and came up with a more mathematically challenging timepiece...

This unusual large format digital clock in the photo shows the time in binary and is exhibited at the German Museum of Mathematics ‘Mathematikum’ in the town of Giessen, Germany. The museum is the brainchild of Prof. Beutelsbacher and has been described as the fi rst ‘hands-on’ mathematical museum in the world.

Components

Relevant websites

Resistors
R1-R8 = 220 Ω
R9-R26 = 1kΩ8
R27-R37 = 100kΩ
R38 = 4MΩ7
R39 = 270kΩ
Capacitors
C1 = 27pF
C2 = 100pF
C3 = 100μF 25V radial
C4-C15 = 100nF
Semiconductors
D1-D8 = bicolour LED, red/green, common cathode (e.g. Conrad Electronics 185000)
D9- D22 = 1N4148
T1-T18 = BC547B
IC1-IC9 = 4017
IC10 = 4060
IC11 = 4081
IC12 = 4013
Miscellaneous
JP1,JP2 = 3-way SIL pinheader with jumper, or miniature changeover switch
X1 = 32.768kHz quartz crystal
7 wire links
PCB, ref. 060030-1 from www.thepcbshop.com

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Tri-State Time

Quartz clock with a trinary display

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Home › Magazines › 2009 › February › Tri-State Time

Tri-State Time

Quartz clock with a trinary display

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