https://stream.echo6.co/videos/watch/3384e818-1fdf-4137-91e1-d98cc7954f6e 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? 😄 Schematic: http://www.eevblog.com/files/DigitalClockSchematic.pdf Forum: http://www.eevblog.com/forum/blog/eevblog-801-how-to-design-a-digital-clock/ Datasheets of all your favourites: https://www.fairchildsemi.com/datasheets/CD/CD4013BC.pdf http://www.nxp.com/documents/data_sheet/HEF4040B.pdf http://www.ti.com/lit/ds/symlink/cd4518b-mil.pdf http://www.ti.com/lit/ds/symlink/cd4026b.pdf http://www.ti.com/lit/ds/symlink/cd4511b.pdf EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 T-Shirts: http://teespring.com/stores/eevblog Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/ 💗 Likecoin – Coins for Likes: https://likecoin.pro/@eevblog/dil9/hcq3 Thu, 14 May 2026 17:20:48 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/3384e818-1fdf-4137-91e1-d98cc7954f6e All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.