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[Ioannis]

What is the input voltage to the 5V regulator?

Suppose it is 12V. Then 12-5=7 volts drop on the regulator.

With a 0,7A current this gives a 0,7 x 7= 4,9 Watts of heat on the regulator. Too much! That is why it gets hot.

Here is a very good link to calculate heat sinks. Read it all as it has very good points.

http://sound.westhost.com/heatsinks.htm

To quickly end with your problem, put the regulator on a large aluminium heatsink,say 4x4x2 cm or lower input voltage to 8 volts.

Ioannis

[astanapane]

Hi Ioannis,

i will try to drop the input voltage to see what will happend.

You are right, the input voltage at the moment is 12V. Which means that we have drop of 7V.

The current though from the display is too high. I dont understand why for this kind of small lcd.

I will also try a heatsink.

thanks a lot.