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28th Jan 2016, 8:03 pm

Building a power supply for my radios/antenna/usb link that needs 13.7/12 and 5V. Got all the bits, built, checked and powered up, BANG, the 5V regulator lost its smoke.

I thought I was being clever by getting a 3A 7805 style regulator for the 5V (you can't have too much current available), wrong, the pinouts are not the standard in/common/out but in/out/common oops!! And of course the tab was grounded (so much for the current limiting).

Moral of this story, read the datasheet first.

28th Jan 2016, 8:03 pm	#1
Guest Guest Posts: n/a	Save yourself a quid or so... Building a power supply for my radios/antenna/usb link that needs 13.7/12 and 5V. Got all the bits, built, checked and powered up, BANG, the 5V regulator lost its smoke. I thought I was being clever by getting a 3A 7805 style regulator for the 5V (you can't have too much current available), wrong, the pinouts are not the standard in/common/out but in/out/common oops!! And of course the tab was grounded (so much for the current limiting). Moral of this story, read the datasheet first.