{"id":610,"date":"2020-11-08T22:51:02","date_gmt":"2020-11-08T22:51:02","guid":{"rendered":"https:\/\/www.root42.de\/blog\/?p=610"},"modified":"2020-11-08T22:51:02","modified_gmt":"2020-11-08T22:51:02","slug":"the-ttl-graveyard-clock","status":"publish","type":"post","link":"https:\/\/www.root42.de\/blog\/?p=610","title":{"rendered":"The TTL Graveyard Clock"},"content":{"rendered":"\n<p>The 74 series of ICs is one of the longest running IC series. They encompass all basic logic functions and more. It is (almost) possible to build basically any digital circuit from chips of this series, without needing to use a micro controller. However it quickly becomes expensive as the transistor density of those chips is not very high. But they are a great way to learn about transistor-transistor-logic, or TTL. Today we\u2019ll build the \u201eTTL Graveyard Clock\u201c, named as such because it\u2026 looks a bit like a graveyard, and this is also where 74 series chips go to die\u2026? Kidding aside, this clock is an impressive design by Sergey Kiselev and a great way to learn soldering as well as to learn how 74 series ICs work. Plus in the end you get a fully functioning 24 hour clock with seconds!<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"The TTL Graveyard Clock\" width=\"840\" height=\"473\" src=\"https:\/\/www.youtube.com\/embed\/aHi2FiNzPQg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The 74 series of ICs is one of the longest running IC series. They encompass all basic logic functions and more. It is (almost) possible to build basically any digital circuit from chips of this series, without needing to use a micro controller. However it quickly becomes expensive as the transistor density of those chips &hellip; <a href=\"https:\/\/www.root42.de\/blog\/?p=610\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;The TTL Graveyard Clock&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[115],"tags":[117],"_links":{"self":[{"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/posts\/610"}],"collection":[{"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=610"}],"version-history":[{"count":1,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/posts\/610\/revisions"}],"predecessor-version":[{"id":611,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=\/wp\/v2\/posts\/610\/revisions\/611"}],"wp:attachment":[{"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=610"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=610"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.root42.de\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}