7400 competition entry: Relative clock/timer/alarm
Towards the end of the ’80s, when I started out in electronics, one day I decided to make a special alarm clock: one, that, when the time comes, switches on some device in my room – be it a radio, TV or anything else. At the time microcontrollers were not easy to find and I didn’t even know how to deal with them anyway, and so I decided to make this circuit out of TTL chips (74xx series).
Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.
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