Missed out on the Fourth of July fireworks this year? No problem! This inexpensive and easy-to-build "rocket" will help bring the excitement to your desktop. Or, if you did get to see a show, keep you entertained all year round. (Especially on those long days at work!) Designed around the LM3914 dot/bar display driver IC and a 10-position yellow LED bar graph display, this fun little project operates on a single CR2032 3V lithium battery controlled by an SPDT switch. Therefore, you will be able to have a blast as often as you want without spending a fortune on batteries.
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