I am trying to design and improve the power input part of my circuit to supply power to a motor driver that controls 2 DC motors. I did some research and i found this circuit but i cannot fully understand why these components have been used. I am using DC batteries to supply 12 V at VS and VIN goes to the VIN input pin of the Arduino UNO.
I read about power supply decoupling capacitors; electrolytic capacitors filters out low frequency signals and ceramic capacitors act as a low pass filter.
I have the following questions:
Why use 2 electrolytic capacitors instead of just one?
Why no ceramic capacitors has been used? Has this been omitted intentionally?
- Why is a high value of 470uF used? I searched and found that many power supply decoupling capacitors are less than 100uF for my application where the supply is only about 12 V DC.
- The Schottky diode is the most intriguing to me. It is a rectifier, so is it also helping to smooth out the DC signal? Shouldn't it be connected in series instead of in parallel?
Thanks for any help.