Serin serout problem

[lerameur]

It is 12v
I am getting .22amp It is getting very hot, but not shutting down.
Should I put a bigger heat sink or maybe two Lm7805 ?

[skimask]

It is 12v
I am getting .22amp It is getting very hot, but not shutting down.
Should I put a bigger heat sink or maybe two Lm7805 ?

Here's a bit of math for ya...
12v input @ .22 amp = 2.64 watts total
5v output, drawing .22 amp = 1.1 watt.
(don't know if you're familiar with this stuff yet)

The regulator has to 'dump' 7v @ .22amp, which is 1.54 watts. That doesn't seem like a lot, but it's enough to make the 7805 hot, even if you've got a heat sink on it.

Do you have any heat sink compound between the 7805 and the heat sink face itself?

(oh...and .22amp for your configuration sounds about right)