maemo.org - Talk - View Single Post - Charger adapter is very hot...

	ndi	2010-01-26 , 01:29
	Posts: 2,050 \| Thanked: 1,425 times \| Joined on Dec 2009 @ Bucharest	#5

Originally Posted by fnordianslip

Yep. Mine got so hot I stopped using it.

[...]

Edit: Come to think of it, I wonder how it can dissipate so much heat? It shouldn't need to be more than a bunch of wires and connectors

It's warm, but not hot, nothing that seems electronics-threatening. I still use it at work with no issues. I use an original Nokia charger that came with my N80. The thin kind

@edit: Really? I expect to see a DC2DC converter, or some kind of SMPSU - thus the heat.

Though I'm guessing they went Chinese on us and used a LM7805. (The expression comes from the USB mug heater that had 3 LM78XX on the bottom). It's by far the easiest way to get 5V, stabilized, and it takes 6-12.

That would explain your heating issues. Older chargers have a higher voltage, especially when open-circuited and the LM dissipates the difference. You could always use a large wattage resistor in series. You DO have a soldering iron, right? :P

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