core LCD backlight diagram

[mikee]

Hi all

ref attatched diagrams:

The first (original) is original circuit (schematic) of the LCD backlight brightness control.

Second (modified) looks better to me, and works very well too  ;)

regards all

lcd bright.JPG

lcd bright.JPG

[nILS]

Difference is your circuit does not only limit current (which is the point of th BL circuit) but also drops the voltage if the trimpot is set to <5k between ground and the wiper.