.Is this heat is a dangerous issue i should think about(how to know that this heat is upnormal level).Are there any solutions.
(I am using a 7.3v 1A wall adapter cause i am using a GSM\GPRS shield+module on the Arduino) Many thanks.
I have a rather tight requirement when it comes to v.reg heating. If you cannot
hold a baby's little pinky to the surface of the device without the baby crying,
then it's too darn hot [this is theoretical only - don't try at home!].
There are several solutions.
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those Arduino bds with the dinky little smt v.regs are really marginal designs, when
it comes to loading and overheating. SOT-223 packages are especially prone to over
heating. You might look for a bd with a larger v.reg package, like TO-220, or at
least a D-Pak. Just because the v.reg says 1A or 0.5A, that's current not heat. -
try a 6V wallwart instead of 7.3V. Those devices have 4-5V extra coming out with
small loading, and the voltage only drops to the rated value with full load as specc'ed.