Hello Everyone,
I am looking for some insite. I am using a Pic 16f, and a Pic 18f in two different projects that eventually will be used in an auto. I'm powering the 16f project from a 9 volt battery for now. It also encorporates a small 2x20 backlite lcd display. It is working fine for the moment. But I'd really like to ditch the 9 volt battery, and power it using the charging system of the car. I was also hoping to change it so that pressing any of the control buttons would wake it up. So it would always be plugged into power. I am hoping to do the same with my second project using the 18f452. I am powering it using a regulated 13.8 volt supply that is plugged into 120vac. It draws .6 amps total at 5 volts. I am actually using a step up device to power a vga screen driver at 9 volts from the 5 volt system. I just changed it to use two regulators, one 7809, and one 7805. The 7809 is power only the screen driver. And the 7805 is powering everything else. The 7809 is getting very hot while powering the circuit at about .5 amps. The 7805, now only having to power the pic, and a fpu co processor is running nice and warm. I worry for how hot the 7809 is getting.
Does anyone have any suggestions as to the best way to power my circuits.
Thanks,
Marcello
I am looking for some insite. I am using a Pic 16f, and a Pic 18f in two different projects that eventually will be used in an auto. I'm powering the 16f project from a 9 volt battery for now. It also encorporates a small 2x20 backlite lcd display. It is working fine for the moment. But I'd really like to ditch the 9 volt battery, and power it using the charging system of the car. I was also hoping to change it so that pressing any of the control buttons would wake it up. So it would always be plugged into power. I am hoping to do the same with my second project using the 18f452. I am powering it using a regulated 13.8 volt supply that is plugged into 120vac. It draws .6 amps total at 5 volts. I am actually using a step up device to power a vga screen driver at 9 volts from the 5 volt system. I just changed it to use two regulators, one 7809, and one 7805. The 7809 is power only the screen driver. And the 7805 is powering everything else. The 7809 is getting very hot while powering the circuit at about .5 amps. The 7805, now only having to power the pic, and a fpu co processor is running nice and warm. I worry for how hot the 7809 is getting.
Does anyone have any suggestions as to the best way to power my circuits.
Thanks,
Marcello