My project is a timelapse utilizing a DSLR, arduino, steppers, and some USB devices. Their various power consumptions follow:
USB (arduino, GPS, etc) = 5V 2A DSLR = 7.4-9 V 2.5A steppers = 12 V
I will use a single 12V source ([3S3P 3.7V LiIon batteries, or 12V DC wall wart) to power all of this. 2 voltage regulators will step down the 12V, 1 to 5V for the USB hub, and 1 for the DSLR.
My concern: This equipment is expensive to me. What suggestions do you have to protect this stuff form a voltage regulator (or wall wart) blowing and destroying the camera, etc? The obvious solution is a fuse.
As far as I can google, a fuse will give over–current protection... but is this what I want? Would this not protect me from over-voltage, the thing I should be most concerned about? If so, what kind of fuse ratings would I choose? E.g., would I want the fuse to burn up quickly or slowly? What voltage/current/other ratings would be appropriate?
Thank you for the help.