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Topic: External power regulator getting really hot (Read 1 time) previous topic - next topic

Runaway Pancake

This is going side-ways, but I posted a hypothetical 1/8-in thick, 1-in sqr., not a cube, and as a supplement, but even then that'll beat a piece of foil.  I even suggested adding another wimpy-fin heatsink, back-to-back.
"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

retrolefty


This is going side-ways, but I posted a hypothetical 1/8-in thick, 1-in sqr., not a cube, and as a supplement, but even then that'll beat a piece of foil.  I even suggested adding another wimpy-fin heatsink, back-to-back.



Just making the point that it's the surface area not the mass that counts. A piece of foil could be more effective if it has greater surface area then your 1 sqr. inch of surface area metal.


Runaway Pancake

This guy (see pic attached) ran hot till I added Heatsink No. 2.
Hey, it's cool.   8)

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

rbmk

It sure seems to have to do with the current usage.
I managed however, to put a wire on a wrong pin and I guess I now have fried my arduino, or at least the USB controller.

Anyways, I decided to work it out a bit, add a power led to the breadboard running from the Vout of the regulator. This works without heating the regulator up. So with the arduino and the ethernet shield attached, there's too much current going through the regulator for usage without a heatsink.

Ordered a 12V to 8V regulator along with a heatsink (and new Arduino). Gonna see what that's gonna do when I can continue.

Grumpy_Mike

Quote
It sure seems to have to do with the current usage.

Derr..

Did you read
http://www.thebox.myzen.co.uk/Tutorial/Power.html

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