The next step for Ahmed Mohamed<br />How to design your own digital clock from 4000 series CMOS chips.<br />Dave reverse engineers a DIY clock he built back in the 1980's as a teenager (he lost the schematics, twice!)<br />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.<br />Does it use Texas Instruments chips from Radio Shack? :-D<br />Schematic: http://www.eevblog.com/files/DigitalClockSchematic.pdf<br />Forum: http://www.eevblog.com/forum/blog/eevblog-801-how-to-design-a-digital-clock/<br /><br />Datasheets of all your favourites:<br />https://www.fairchildsemi.com/datasheets/CD/CD4013BC.pdf<br />http://www.nxp.com/documents/data_sheet/HEF4040B.pdf<br />http://www.ti.com/lit/ds/symlink/cd4518b-mil.pdf<br />http://www.ti.com/lit/ds/symlink/cd4026b.pdf<br />http://www.ti.com/lit/ds/symlink/cd4511b.pdf<br /><br />EEVblog Main Web Site: http://www.eevblog.com<br />The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2<br /><br />Support the EEVblog through Patreon!<br />http://www.patreon.com/eevblog<br /><br />EEVblog Amazon Store (Dave gets a cut):<br />http://astore.amazon.com/eevblogstore-20<br /><br />T-Shirts: http://teespring.com/stores/eevblog<br /><br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
