I’m trying to build a fan controller. My power source is a +24 V battery which is commonly used in cars.
I want use a regulator module (buck step-down regulator based on the CN3903).
This is my schematic:
[EDIT : wrong cap number]
C4: for +24 V battery input ripple
C9: for +5 V output ripple
How can I calculate the capacitor values when drawing a circuit using these regulator modules?
If I have an oscilloscope, do I apply the required maximum load and set it to the maximum noise and ripple-free value?