Tearing down a failed LED bulb

todd-harrison-led-bulb

[Todd Harrison] was thinking of replacing some incandescent light bulbs in his house with LED models, so and his wife picked up a single candelabra bulb to test before they spent the cash to swap them all out. The bulb died in about a week’s time, so [Todd] got out his trusty electronic disassembly device (his hammer), sharing his post-mortem examination with us.

After taking a cursory look at it, [Todd] found that the circuit powering the bulb was not overly complicated. A small bridge rectifier along with a few caps and resistors are all that was used to power the device, making it’s failure a bit puzzling. When [Todd] wired it up to his power supply, the bulb lit up, much to his surprise. His best guess as to why it died is that the shrink wrap around the PCB managed to cause a short, though he also noticed that one of the bridge rectifier’s legs was not soldered down.

He started tooling with the light to find out more about it, but he managed to blow out a handful of LEDs in the process. All in all the LED lighting swap was a disappointment, but at least he had some fun along the way!

Continue reading if you’re interested in seeing [Todd’s] diagnosis in its entirety.

[Read more...]

An EEWeb Interview with Todd Harrison

Although Todd Harrison could be one of many of our readers (and most of our writers), it was nice to see one of “us” featured in [EEWeb]. [HAD] has featured him before in posts such as this recent one about replacing solder tab batteries.

What may be interesting to many is that soon after [Todd] graduated he took a job as a computer programmer, but like many other part-time makers, he still had the need to physically create and modify things. This article goes over some of his preferred tools, as well as some of the various projects that he’s done or is working on now.

In the article, [Todd] goes over what he sees as the biggest challenges to inspiring new generations of engineers. One of these is that circuitry is increasingly locked down and are not easily tinkered with. Without exploring how things work, his view is that fewer will be inspired to go into engineering. Although there is certainly some validity to his point, as some doors close, others hopefully will open. The accessible learning environment of the Internet, open source resources, and many maker-friendly materials like the Arduino should help to fill in the gaps.

For more information, [Todd] also has his own blog, Toddfun.com, which features his projects.

Follow

Get every new post delivered to your Inbox.

Join 96,376 other followers