The next generation LED chips?
Added 2019-02-05 20:21:24 +0000 UTCThis fairly standard looking COB array was very interesting to explore.
I specifically bought a blue one (no phosphor) so I could take a closer look at the chips.
https://www.youtube.com/watch?v=hpF5O0W8Bdg
I've done some extra testing since, so the video description on YouTube contains more info.
I'm intrigued to see how this new style of chip lasts in real life use. It would be good to see them used in the older style 20-100W low voltage COB arrays to see if it resolves the bond problems. That would allow easier flicker-free operation using the existing switchmode drivers.
Comments
I found an article about LEDs like this, though I'm not sure they're done quite the same way. Same idea about getting rid of a bond wire though. Link: <a href="https://www.led-professional.com/resources-1/articles/3-pad-led-flip-chip-cob" rel="nofollow noopener" target="_blank">https://www.led-professional.com/resources-1/articles/3-pad-led-flip-chip-cob</a>
2019-02-12 23:38:38 +0000 UTCI would think its .2mm could be .1 prepreg with .5oz copper on alu core
Zach Allin
2019-02-07 07:57:35 +0000 UTC<a href="https://www.ebay.com/itm/263929834420" rel="nofollow noopener" target="_blank">https://www.ebay.com/itm/263929834420</a>
Big Clive
2019-02-06 16:47:20 +0000 UTCIt's probably resilient to humidity, biot not lying water. Especially in the terminal area.
Big Clive
2019-02-06 16:45:10 +0000 UTCI did notice it hadn't been marked. If they had been small solder pads they could have put a touch of solder there when the paste was being applied in the 110V or 220V areas for the resistor positions.
Big Clive
2019-02-06 16:44:09 +0000 UTCIt's cheapness winning over functionality.
Big Clive
2019-02-06 16:41:44 +0000 UTCI don't give my address out because too many people would send stuff. I'm pretty tight for space here at the moment.
Big Clive
2019-02-06 16:40:30 +0000 UTCI tend to buy from eBay because the AliExpress sellers are not very good when it comes to shipping tot he Isle of Man. In some instances they let you buy something and then when you pay for it the address system doesn't allow shipping to the Isle of Man.
Big Clive
2019-02-06 16:39:36 +0000 UTCIs that a waterproof module?
Mr Train
2019-02-06 08:21:24 +0000 UTCYou can see how this design would reduce production time and cost, should allow for much more automation. I'm still blown away by the colour changing LEDs you sent, I made a video where I cut the top flat and used IPA as a lens to look at the anvil, the size of the mcu in there was just mind blowing, hard to imagine how the production process works for those.
The Tinkering Shed
2019-02-06 08:13:42 +0000 UTCAny chance of a link to the search. Can't find any of the ones with the crunchy connectors.
John Carr
2019-02-06 01:55:14 +0000 UTCI noticed at the bottom of the panel there are two little circles for a place to note whether it is arranged for 110 volts or 220 volts. But yours has neither of them filled in although we know it was a 220 volt panel. Did the infill just rub off or something? Great vid. Very interesting.
2019-02-05 23:11:52 +0000 UTCPosted this comment on YT aswell. Very interesting video and product. This package style is called a "Flip-Chip", didnt know they made LEDs like this, I have seen it be used for processing chips, I think the raspberry PI wifi IC is a flip chip for example. the chip is essentially upside down, with the bond/solder point and junctions on the bottom, and a substrate on top. whereas the bonded LEDS have the bond points and junctions on the top and substrate on the bottom. there are some good articles online about this LED style just google "led flip chip". also the led chips don't look that much different in size to the smallest surface mount resistor packages. they can be pick and placed by most modern industrial pick and place machines.
Gareth Bass
2019-02-05 22:42:37 +0000 UTCGreat Video Big Clive, Thank You.
2019-02-05 22:29:09 +0000 UTCThe flickering is really annoying for me. I don't see why anybody would want these.
Mark Trombley
2019-02-05 22:15:00 +0000 UTCVery interesting! I have a 400VA isolating transformer fed from a variac in my shop which I use for those "prodding" exercises - still demands respect but less likely to kill you if you touch one output. Since they use a linear regulator, I wonder if you could feed a batch of these modules from a single rectified & smoothed supply - maybe limit the power by dropping the input voltage with a LT transformer in antiphase since each LED will now be running at 100% duty cycle. That would deal with the flicker. Might get some and give that try...
Gordo
2019-02-05 21:52:29 +0000 UTCYay for Super Full-On Bear Strength! ;)
2019-02-05 21:03:17 +0000 UTCOn Youtube you state: "If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at: <a href="http://www.bigclive.com/coffee.htm" rel="nofollow noopener" target="_blank">http://www.bigclive.com/coffee.htm</a>". I thought I asked this a while ago, but I can't find this post anymore: the linked site doesn't tell, how to send you stuff for taking it to bits (what I would, including some goodies)... how can it be done?
Jörg Schötz
2019-02-05 20:47:29 +0000 UTCJust out of curiosity, I see you get a lot of these gadgets off of eBay vs say AliExpress or the like which I imagine has the same sources. Is that from experiencing the sellers on eBay being more reliable or the like? Just love, love your videos, I'm a software engineer but I've always dabbled with electronics and your teardowns willed with explanations are spot on. Also can't believe the pace you put these out at, please pace yourself so you don't burn out!
Nicolas Pottier
2019-02-05 20:43:00 +0000 UTC
