AceOfHearts
New Member
Hi,
Its a bit strange. I have two 7805, one for two small DC motors and one for other devices including my LCD and its backlight (I'm building a robot).
Strangely, when my backlight is on, the 7805 it is connected to (not the DC motor's one) becomes very hot, and I have to turn it back off again.
This is so strange because there is no noticable heat in the 7805 powering the DC motors but the 7805 for LCD backlight becomes really hot...
I have tried inluding series resistance in with the backlight (using a potentiometer) but getting the same problem.
I can always get a heatsink for that 7805, but its just too strange a simple backlight could cause so much power dissipation in that 7805?
I have looked for short circuits etc. Nothing found.
Its a bit strange. I have two 7805, one for two small DC motors and one for other devices including my LCD and its backlight (I'm building a robot).
Strangely, when my backlight is on, the 7805 it is connected to (not the DC motor's one) becomes very hot, and I have to turn it back off again.
This is so strange because there is no noticable heat in the 7805 powering the DC motors but the 7805 for LCD backlight becomes really hot...
I have tried inluding series resistance in with the backlight (using a potentiometer) but getting the same problem.
I can always get a heatsink for that 7805, but its just too strange a simple backlight could cause so much power dissipation in that 7805?
I have looked for short circuits etc. Nothing found.