Inside a mains voltage sign LED module
Added 2022-02-19 06:20:07 +0000 UTCI didn't even know they made 120 and 240V versions of these, but when I found out I ordered some to see how they power the LEDs.
https://www.youtube.com/watch?v=qH1E2lwxUwM
It's actually pretty neat.
Comments
I think they must be, because there must be a stabilization time for the linear regulator. Worst case of the power being applied at he peak of the sinewave would be the current being limited to something surprisingly low due to the combined LED forward voltage and the near 1000 ohms resistance. Maybe 100mA peak?
Big Clive
2022-02-19 19:31:33 +0000 UTCI wondered if the 2x 470R were a little bit of transient protection. If so, they would be better placed upstream of the bridge. Worst case single fault is probably one diode in the bridge going short.
Mike Page
2022-02-19 15:52:54 +0000 UTCWhere would we be without LED's these days- such a brilliant (pun intended ) invention !
Mike Hughes
2022-02-19 13:29:03 +0000 UTCYeah, I've featured that in the past. (In 2015) https://www.youtube.com/watch?v=3EYE9tpv5R0
Big Clive
2022-02-19 07:15:49 +0000 UTCBigClive ... have you seen this? https://youtu.be/_bgUy6zA0ts
Wolfie RARAR
2022-02-19 07:05:49 +0000 UTCDitto!
Wolfie RARAR
2022-02-19 06:42:54 +0000 UTCLMFAO @ 1.7 "Silly Amps" :D you make me laugh Clive... great video as always... I bought a few of these, thanks for the teardown!
Wolfie RARAR
2022-02-19 06:41:59 +0000 UTCInteresting. Thanks. ... FYI, I spent the first few minutes of the video waiting for the red & black alligator clips to short out on each other. :-)
Jack Hodgson
2022-02-19 06:38:24 +0000 UTC
