Electronics > Projects, Designs, and Technical Stuff
I am at a loss as to figuring out how to track down this short.
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james_s:
Maybe there's a something insulating one of them? Anodized heatsink with thermal paste on the part might provide just enough insulation to prevent a short, I certainly wouldn't rely on it though. It's also possible that you do have a solder bridge or defective component on the shorted board.
cdev:
Whenever I have one working unit and one non working, a problem is usually findable quickly by comparing the two electrically. Even if one doesnt know electronics beyond the basics, simply compare the two.

First with power removed and capacitors discharged, check for shorts and opens.
ciccio:
LM3886T's tab is connectedt to V-, and if it is conected to ground via a grounded heatsink the IC will blow, together with other components.
You need an insulator, but it is difficult to source  because it is larger than  standard TO220 or plastic TO3 insulators.
There is a simple solution:
LM3886TF has an insulated tab, and it will work in your circuit.
I've used many hundreds of them, but now I do not find them on TI site anymore, even if Mouser has them still available.

Best regards
Hextejas:

--- Quote from: ciccio on January 26, 2019, 09:50:51 pm ---LM3886T's tab is connectedt to V-, and if it is conected to ground via a grounded heatsink the IC will blow, together with other components.
You need an insulator, but it is difficult to source  because it is larger than  standard TO220 or plastic TO3 insulators.
There is a simple soluti3886TF has an insulated tab, and it will work in your circuit.
I've used many hundreds of them, but now I do not find them on TI site anymore, even if Mouser has them still available.

Best regards

--- End quote ---
I should shoot myself at all the confusion, $$$$$, and troubles I have been causing myself. The original parts list called out the TF version but I, in my ignorance, was not careful when ordering. A oainful lesson. |O
Sheesh !!
james_s:
Well it's not that big of a deal, you can get thermal pad material that can be cut to size.
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