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Topic: 12v input to 7805 voltage regulator heating in a second?? (Read 309 times) previous topic - next topic

zoomkat

Incorrectly wiring a 7805 will make it get very hot very quickly if it is supplied from a strong power source. Check your wiring, Two leads are probably reversed.
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

C-F-K

The 78XX series actually work by dissipating the extra power into heat to create the output voltage. Therefore the efficiency of those things are the worst ever, just second to a 100W light bulb.

Can you get your hands on a "real" DC-DC converter? Efficiency and output are much better on those and you don't have to worry they get hot, so you don't need a giant heat sink to keep things cool.
World Domination?

Yes please, i'll take 3 right now!

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