The digital clock of circuit, has as base one IC, the MM5314N, in which are contained all the circuits that need. The IC1 collaborates with six display of common anode, that are not critically as materials. You can select what dimension, you want it is enough you adapt pins their in the circuit. The display are drive by a system of polyplexis and are drive by thirteen transistors. For timing the circuit, is used the frequency of network 50HZ.
http://users.otenet.gr/~athsam/digital_clock_with_MM5314N.htm
http://www.hobby-elec.org/e_pic6_7.htm
Informative illustrated guide to how Digital Clocks operate including instructions describing how to build your own.
http://www.howstuffworks.com/digital-clock.htm
A Radio Controlled Clock. But this clock works with Japanese readio clock system.
http://www.hobby-elec.org/e_pic6_d.htm
an LED matrix is used for the display of a day of the week
http://www.hobby-elec.org/e_pic6_e.htm
The calendar and the time informations are obtained from the circuit though RS232C interface
http://www.hobby-elec1.org/e_pic6_h.htm
digital clock that operates with very high accuracy by synchronizing to the color burst signal in the television picture signal
http://www.hobby-elec.org/e_clock0.htm
digital clock with very high accuracy which is controlled by PIC.
http://www.hobby-elec.org/e_clock_v2.htm