Would you mind posting how you solved it so others can learn?

 

It took me a while but I finaly got to draw the schematic. The 74183 are full 4-bit adders and the 74157 are quad 2-to-1 adders. I know the 74xx series is nowadays useful only for educational purposes, but it is the only one I am familiar with. If someone has suggestions about anohter familly, I 'll be happy to hear them.

P.S. Does anyone know a good software for drawing quick logic diagrams and semi-complete schematics? SmartDraw is driving me ever closer to a warm place in hell .

 

Here is how to use a 74192...

 

It took me a while but I finaly got to draw the schematic. The 74183 are full 4-bit adders and the 74157 are quad 2-to-1 adders. I know the 74xx series is nowadays useful only for educational purposes, but it is the only one I am familiar with. If someone has suggestions about anohter familly, I 'll be happy to hear them.

P.S. Does anyone know a good software for drawing quick logic diagrams and semi-complete schematics? SmartDraw is driving me ever closer to a warm place in hell .

try to use proteus

 

Would you mind posting how you solved it so others can learn?

i cant post it yet.. my classmates would see it... maybe next week after submission... i just put the reset on 12... i put some logic on the output of 74393 so that the input on 7447 will be 2 1 2 3 4 5 6 7 8 9 0 1 equivalent to 0 1 2 3 4 5 6 7 8 9 10 11, respectively....

 

try to use proteus

Thanks! I' ll give it a try.

 

can I ask for a schematic diagram of the 12 hour digital clock? I badly need it for my assignment in logic.

 

can I ask for a schematic diagram of the 12 hour digital clock? I badly need it for my assignment in logic.

http://www.instructables.com/id/12-Hour-TTL-clock/