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7805

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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...
 
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..
 
The 7805 can easily supply 600mA. I think its input from the unregulated supply drops lower than its minimum input of 7.5V.
 
Try adding a 4700:mu:F capacitor in parallel with the input to the regulator.
 
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