Reverse engineering from a picture
Added 2021-05-10 01:16:49 +0000 UTCThis is just a short extra video where I reverse engineered an LED lamp with a new style of current regulator chip.
Thanks to Ron in the Netherlands for taking and sending the picture.
Comments
Wait, you can send pictures? Look out Clive 🤣
Mark Holder
2021-05-18 19:16:00 +0000 UTCGood find. I wonder if it's going to be one of those bulk cloned footprints.
Big Clive
2021-05-11 03:54:01 +0000 UTCNice find. It's always frustrating when you can't find the right data sheet. Yes, ammo1 probably removed the plastic "bulb" and went no further, as shown in his picture, apparently not following Clive's thorough taking things to bits procedure. Ron in the Netherlands, who sent Clive his picture, would most likely have sent a picture of the back of the board if it had anything on it.
2021-05-10 16:04:13 +0000 UTCThe same search brings up a Joulwatt product listing where they say it uses an HSOP7 package, and googling for that package type brings up a datasheet for MT7607H which is a rectifier/regulator combination with the same pinout from another manufacturer, so it's definitely a thing. Also, I see no sign in that livejournal post that ammo1 actually looked at the other side of the board :-)
2021-05-10 10:37:29 +0000 UTCWOW! I guess this chip reduces the LED lamp to it's most simplistic. All they need to do now is to incorporate an LED into the package and there we have it, the lamp on a chip. I guess there will still need to be the external Capacitor and resistors, heat sinking of the chip lamp combo will be a challenge but that is a mere triviality!
Dr Andy Hill
2021-05-10 07:25:38 +0000 UTCYeah, that sounds all well and good, but there's gonna be some kind of trade off and my radios are always at the end of the short LED stick it seems like! (goes off to fiddle his knobs...)
Michael Thompson
2021-05-10 04:09:44 +0000 UTCAn advantage of linear current regulators is that they don't generate RFI like switching regulators do.
2021-05-10 04:04:23 +0000 UTCA Google search for JWB1981 brings up a page in Russian at https://ammo1.livejournal.com/1212466. Translated by Google, it indicates that "The diode bridge appears to be on the back of the board." So this may not be much of anything new, except for the odd position of the capacitor on the front of the board, where it will probably get too hot.
2021-05-10 04:03:18 +0000 UTCDevice package name should be trademarked as ODD-PAK.
Roddy Reavis
2021-05-10 02:48:40 +0000 UTCWell it looks like I'm awake now! I was on the fence, but I'm up now! LOL! More and more simplistic all the time! I wonder how much RFI they are generating?
Michael Thompson
2021-05-10 02:22:55 +0000 UTC
