Cool little LED vehicle bulb/lamp
Added 2023-04-26 04:44:13 +0000 UTCI was expecting this neat little lamp to use a simple resistor current limiter, but in reality it has a linear regulator made with standard common components.
Quite a neat and educational little circuit.
https://www.youtube.com/watch?v=rkioyCFfy34
Comments
Needle tip bottle from eBay. Often sold in packs.
Big Clive
2023-05-02 21:04:56 +0000 UTCI like the long probe Clive has on his IPA bottle. Looks jolly handy for getting into awkward spaces for dismemberment reasons. Another thing to add to the repair toolkit. :-)
Jon Knight
2023-05-02 20:21:08 +0000 UTCI don't know if this one would pass enough current to trick the sensing circuit.
Big Clive
2023-04-27 05:31:37 +0000 UTCYeah, the LM317 is very useful as both a current and voltage controlled supply.
Big Clive
2023-04-27 05:31:08 +0000 UTCI have been using the LM317 in this configuration for years without realising it was a Linear Regulator. I just looked at it as a constant current source. I presume the names just means the same.
Zeedijk Mike
2023-04-26 20:19:45 +0000 UTCI wonder if this bulb would trick the bulb out error warnings in modern vehicles. I have tried a few led bulbs similar to this shape and they all give me a warning of bulb out. What are the key words to search for this bulb and was it on Ebay?
Matt Larson
2023-04-26 19:46:01 +0000 UTCNice teardown. Seems similar to a 317. If so, it veers towards low thermal dissipation. I'd like to see a V/I curve.
Mike Page
2023-04-26 19:43:37 +0000 UTC"Now play with it!"
Curtis Hoffmann
2023-04-26 16:59:16 +0000 UTCI'd be interested to see thermal images of this bulb after it's been running for a while.
evilution
2023-04-26 16:19:37 +0000 UTCInteresting lamp, I like the construction as it's easy to take apart and reverse engineer. I'm currently converting a 7 lamp aftermarket third brake light (with incandescent 5W bulbs of this style) to run as a KITT scanner with PWM control from an Arduino. I know that this control circuitry won't handle PWM dimming but I could just remove the active components and run this directly. My wiring is currently set up to handle the almost 4A on the common positive, would be nice to reduce that! Normal LED bulbs just look rubbish, whereas this has a good look to it.
Matt Tester
2023-04-26 12:51:33 +0000 UTC"It's out!" "It's out!"
Curtis Hoffmann
2023-04-26 07:47:57 +0000 UTC
