Fun what was this? - Page 1
Forum section: electronics / general

author: Kayron
author_rank: Newbie
timestamp: March 11, 2016, 11:07:02 am
content: what was this?http://s1083.photobucket.com/user/captain_evil1/embed/slideshow/EEVblog

author: daqq
author_rank: Super Contributor
timestamp: March 11, 2016, 11:10:57 am
content: Blown LED light bulb power supply?

author: elgonzo
author_rank: Unknown
timestamp: March 11, 2016, 11:19:31 am
content: Yup, looks like the PSU of an LED light bulb with a GU10 socket.

author: Kayron
author_rank: Newbie
timestamp: March 11, 2016, 11:22:38 am
content: Quote from: daqq on March 11, 2016, 11:10:57 amnot complete 1/2 there, go back 8 years

author: Kayron
author_rank: Newbie
timestamp: March 11, 2016, 11:23:42 am
content: Quote from: elgonzo on March 11, 2016, 11:19:31 amno LED in that.

author: elgonzo
author_rank: Unknown
timestamp: March 11, 2016, 11:28:20 am
content: Quote from: Kayron on March 11, 2016, 11:22:38 amOkay, perhaps it is not LED, but rather one of those wacky energy-saving light bulbs that take 10 minutes to get bright...

author: Kayron
author_rank: Newbie
timestamp: March 11, 2016, 11:42:46 am
content: Quote from: elgonzo on March 11, 2016, 11:28:20 amyes but 2 minutes to get bright...

author: elgonzo
author_rank: Unknown
timestamp: March 11, 2016, 12:17:34 pm
content: Quote from: Kayron on March 11, 2016, 11:42:46 amAnd then it made poof, let the magic smoke out and was dark forever

author: ericloewe
author_rank: Unknown
timestamp: March 11, 2016, 12:23:48 pm
content: Quote from: elgonzo on March 11, 2016, 12:17:34 pmBetter the magic smoke than the not-quite-magic mercury.

author: Kayron
author_rank: Newbie
timestamp: March 11, 2016, 12:35:46 pm
content: Quote from: elgonzo on March 11, 2016, 12:17:34 pmwell 1 out of 4 is gone Cost me £15(UK) for one and 8 years old so

author: Richard Crowley
author_rank: Super Contributor
timestamp: March 11, 2016, 12:56:43 pm
content: Yeah, I am seeing a high failure rate for my CFL lights. Replacing with LED.Considering the similar cheap construction, I don't have high hopes for LED, either.

author: TerraHertz
author_rank: Super Contributor
timestamp: March 11, 2016, 01:40:03 pm
content: Those 4 eyelets, that presumably connect to the 2 filaments of the tube, *how* do they connect? Spring contacts?The eyelets don't seem to have soldered very well. And they have resist laid over them on the solder side.Here's a similar piece of junk, in which the contacts are small metal springs, pressing on solder-flowed fingers on the PCB. See pics. Yes, it went intermittent and vibration sensitive, then failed completely. Transient voltage spikes due to the arcing?Spot the other amusing thing about this CFL. So, these were intended to replace filament light bulbs. But what does this one contain?A 'light bulb'.Well, close to it. See the glass tube that is one of the two mains input leads? It contains a 'filament', that is about 0.8 ohms when cold, but reduces resistance when hot. It probably doesn't get to actually glow, but is there as an inrush current limiter/fuse, so presumably operates fairly warm. Otherwise why not just use a wire?.

author: Stonent
author_rank: Super Contributor
timestamp: March 12, 2016, 10:56:12 pm
content: Quote from: Richard Crowley on March 11, 2016, 12:56:43 pmYep, the bulbs that I've dealt with, the tube is still sound, but the base became severely discolored and eventually failed.Some of the cheap LED bulbs don't even have any active parts, just a string of leds in inverse-parallel, and a capacitor and/or resistor.