I am designing a circuit for
PIC MCU. I am facing few problem on power supply for them. I will be giving 12v to the circuit. Now PIC works on 5volts and SIM900 works on 3.2v – 4.8v. At first I thought of using two different voltage regulators. But Now i am using
7805 to convert 12v to 5v and then using a voltage divider to convert 5v to 4v. Below is the schematic:
Here input voltage is 12v and using 7805 to convert it to 5v which will be given to PIC MCU. This 5v is also used in voltage divider circuit to convert it to 4v for SIM900. I have used
R2=400 for voltage divider circuit. Is this circuit safe to use. Does voltage divider circuits are good to use. Please help. Thanks.!