I let the smoke out (rayovac swap)

[crackerkorean]

My 3watt Rayovac 2AA is my EDC and I was swapping out for a Seoul.

I know my first mess up was not testing the led by it self.
Second was checking continuity of the LED after it got epoxied down.

Either way two lessons learned.
But now to fixing it so that I can have my light again.
When I applied battery power to the light it started smoking. I was looking at it and it seems that I toasted the inductor.

So is there a way to save the light? I think these particular LEDs I got from Kai but used them in anohter build and havent had a problem yet.

Where can I get a driver to get this up and going again.

Thanks for any help.

 

[crackerkorean]

Ok right before bed I connected the LED to some batteries to test it and all is ok withe LED.

If memory servers it seems the positive side has continuity with the heatsink???? I thought the neg side (notch) was tied to the slug.
I guess thats what killed the driver.

Wanting to keep things on the cheaper side I found this on kai and was wondering if anybody has messed with it
http://www.kaidomain.com/WEBUI/ProductDetail.aspx?TranID=3151

 

[datiLED]

Ok right before bed I connected the LED to some batteries to test it and all is ok withe LED.

If memory servers it seems the positive side has continuity with the heatsink???? I thought the neg side (notch) was tied to the slug.
I guess thats what killed the driver.

Wanting to keep things on the cheaper side I found this on kai and was wondering if anybody has messed with it
http://www.kaidomain.com/WEBUI/ProductDetail.aspx?TranID=3151

I believe that you will find that the board is much too big for the ROV heatsink. I bought a dead ROV for a mod, to discover that all of the usual 15 and 16mm driver boards were much too big. I ended up building a LTC3490 driver dead bug style, and epoxying it inside of the heatsink, because that was all that would fit.

Maybe you could try replacing the Zetex FMMT617 on the original board, as that is what usually fries first.

 

[crackerkorean]

After some playing around last night I found that the driver is not completly dead. It still works kind of.

It started out as the 3watt light but now even with a seoul puts out less that the 1watt version.

The inductor took the hit and started smoking, can replace just the inductor?

I guess I can do what you do to have a useable light again. Do you have any links or info on how to do a driver like the one you did?

 

[datiLED]

After some playing around last night I found that the driver is not completly dead. It still works kind of.

It started out as the 3watt light but now even with a seoul puts out less that the 1watt version.

The inductor took the hit and started smoking, can replace just the inductor?

I guess I can do what you do to have a useable light again. Do you have any links or info on how to do a driver like the one you did?

I built the drivers directly from the schematic listed in the datasheet. I have also used the MAX1797 with good results. It is set at about 1A, but don't try this with alkalines!

 

[crackerkorean]

Check your PM