Engineer makes light-up business cards with 555 timer, proves PCB skills
![](https://s.yimg.com/ny/api/res/1.2/dZOqmhb7NB7d9nOtRXOIQw--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTcyMA--/https://s.yimg.com/uu/api/res/1.2/rrBLEeSmXrycSpGNFYtVXg--~B/aD00MDA7dz01MzM7YXBwaWQ9eXRhY2h5b24-/https://www.blogcdn.com/www.engadget.com/media/2012/06/biz-card.jpg)
Sure, there have been some pretty creative variations on the standard paper business card, but if you're looking to make a career in electronics engineering, card stock isn't necessarily the best option for material. Such was the case for one student, who had the canny idea to make a card that demonstrates his printed circuit board know-how. He used a 555 timer that outputs a clock to the LEDs on the biz card, and placing a nine-volt battery on the terminals sets off the mini light show. See for yourself in the video below.