Hi,
I would like to make a digital clock using a PIC 16F877 mcu, I need two supplies, a 5 V (max current 100 mA) and a 12 V (max current 150 mA). The device is to be powered from a car battery (12 V Lead acid re-chargeable).
I would like to know how I should reduce battery supply and current to a more tolerable level as the car battery supplies quite a high current ?
I plan to use a LM 7805 voltage regulator ICs to get the 5 V supply, and a 12 V zener diode for the 12 V supply.
Kindly advise a suitable method, the device must not overheat or consume excess current.
thanks
arunb
I would like to make a digital clock using a PIC 16F877 mcu, I need two supplies, a 5 V (max current 100 mA) and a 12 V (max current 150 mA). The device is to be powered from a car battery (12 V Lead acid re-chargeable).
I would like to know how I should reduce battery supply and current to a more tolerable level as the car battery supplies quite a high current ?
I plan to use a LM 7805 voltage regulator ICs to get the 5 V supply, and a 12 V zener diode for the 12 V supply.
Kindly advise a suitable method, the device must not overheat or consume excess current.
thanks
arunb