I have a 16 x 2 LCD
Dear salman,
Use 100 ohms resistors for LCD backlight[pin 15,16]. Connect directly 5V to microcontroller & LCD. If you are not using 100 ohms resistor the regulator will get heat & you need heat sink.
If he use stronger voltage regulator needed heatsink will be smaller for that job, and in some cases not even need. Its obvious situation.
Heatsink is not required in this design,
and 78S05 will be cooler then 7805.
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