The next step for Ahmed Mohamed
How to design your own digital clock from 4000 series CMOS chips.
Dave reverse engineers a DIY clock he built back in the 1980's as a teenager (he lost the schematics, twice!)
Before the days of microcontrollers, cheap PCB's, and internet mail order parts, you built stuff on veroboard using discrete parts from your junk bin salvaged from old teardowns.
Does it use Texas Instruments chips from Radio Shack? :-D
Schematic: http://www.eevblog.com/files/DigitalC...
Forum: http://www.eevblog.com/forum/blog/eev...

Datasheets of all your favourites:
https://www.fairchildsemi.com/datashe...
http://www.nxp.com/documents/data_she...
http://www.ti.com/lit/ds/symlink/cd45...
http://www.ti.com/lit/ds/symlink/cd40...
http://www.ti.com/lit/ds/symlink/cd45...

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