7805

[desperadogear]

whats the solution for this overloading problem?

 

[Nigel Goodwin]

For a start measure the current it takes from the 7805, first without the backlight, then with it.

 

[ikalogic]

i never actually done the calculations...but a project with 9V battery feeding a micro controller, an LCD with white backlight, and IR proximity sensor ABSOLUTLEY needed a heat sink...

 

[desperadogear]

For a start measure the current it takes from the 7805, first without the backlight, then with it.

im really sorry if i was late to follow up.i got current measurement as 600 mA..

 

[audioguru]

The 7805 can easily supply 600mA. I think its input from the unregulated supply drops lower than its minimum input of 7.5V.

 

[Hero999]

Try adding a 4700:mu:F capacitor in parallel with the input to the regulator.

 

[desperadogear]

will try it right away. was using 1000 uF