Radio timecode clock using graphical programming and a CPLD chip
A Telling Way of Telling the Time
Published in issue 362, February 2007
A fair number of radio-controlled clocks have appeared in Elektor Electronics but none before like this. What makes it unique is the use of highly flexible CPLD technology to decode the signals. Despite its complexity, our straightforward instructions will make sure that even beginners make a first-class job of this design.
Resistors
R1-R4,R22,R23 = 1kΩ
R5,R6 = 33kΩ
R7 = 9kΩ1
R8,R16=100kΩ
R9 = 22Ω
R10,R20,R21 = 2kΩ2
R11-R15,R25 = 1kΩ 7-way SIL array
R17 = 470kΩ
R18,R19 = 22kΩ
R24,R27 = 10kΩ
R26 = 100kΩ multiturn preset
PH1 = LDR 9060
Capacitors
C1,C6 = 10μF 16V radial
C2,C3,C11 = 10nF
C4,C7,C8,C9,C10,C12,C13,C14 = 100nF
C5 = 1nF
C15 = 470μF 16V radial
Semiconductors
D1,D2 = 1N4148
T1 = BC557B
T2,T3 = BC547B
IC1 = 74LS122
IC2 = 74LS14
IC3 = NE556
IC4 = EPM7128SLC84-15, programmed, order code 050311-31
IC5 = NE555
IC6 = 7805
LD1-LD6 = SA52-11GWA (7-segment display with 90-degrees socket
Miscellaneous
K1 = 3-way SIL pinheader
K2 = 2-way SIL pinheader
K3 = 4-way SIL pinheader
JP1 = jumper
JP2 = 3-way jumper
DCF77 radio timecontrol receiver module (see text)
IC sockets
84-way PLCC socket
Enclosure Eurobox type KGB 13
PCB, ref. 050311-1 from www.thepcbshop.
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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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