Colored pyrotechnics

Regular submitter [Jared Bouck] from Inventgeek.com has sent us this cool project. He wanted to make a fireball cannon, but didn’t want to settle for plain old fireballs.Instead of using a common  propane system, he built an alcohol based one so he had a “blank slate” to start with. He then applied some copper chloride to get the desired greens and blues. With all of the fire displays we see, how come we don’t see more colored flames? Check out the overview video after the break.

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EEVblog: the Electronics Engineering video blog


Have you ever wanted to see what it’s like inside of a PCB assembly factory? Have you ever wondered how digital storage oscilloscopes work? If so, be sure to check out the EEVblog podcast. The Electronics Engineering video blog podcast, hosted by [Dave Jones], was created for anyone interested in learning more about electrical engineering. While some knowledge of electronics definitely helps, [Dave]’s thorough explanations and firsthand knowledge in the field of electrical engineering make the video blog easily accessible to beginners in the field. The EEVblog covers a wide range of electronics related topics, offering everything from multimeter reviews to GSM mobile phone audio design advice. In the latest episode (shown above), [Dave] discusses and demonstrates how to solve the infinite resistor problem, involving measuring the resistance at different points of an infinite grid of resistors that all have the same resistance. In addition to giving a detailed explanation, [Dave] created a 14 x 14 grid of 420 10ohm resistors to demonstrate how to solve the problem. While we’ve only mentioned a few episodes here, be sure to check out all 25 episodes of the EEVblog podcast and subscribe to the RSS feed so you’ll never miss an episode.