I created a guitar pedal with Arduino and am looking to transfer the project project away from my Arduino Uno (by taking what I need from the Uno and creating my own PCB with the ATMega328).
Looking at the Uno schematic, I see that a fuse is used by the USB power, but not by the 9V DC Jack power. Why is this?
Since my project will exclusively taking power from a DC Jack (not USB), I'm assuming I don't need a fuse? Looking at other guitar pedal schematics, I don't see almost any that use them, but I'm not sure why this is.
Also, my guitar pedal involves about 10 lights/switches and an LCD screen, making it a more complex design than most pedals. I'm not sure if this increases the need for a fuse, or how I would go about determining what I need.
The 9V would be coming from a DC jack (if that makes a difference), but I agree with you that 9V may not be enough. Is there any way I can test this besides just trial and error?
The weird thing is the Arduino has a voltage regulator that turns the incoming 9V into 5V. So the breadboarded version I've been working on has basically been functioning off of 5V without issue, unless I'm misunderstanding something.
I believe you are correct but it is possible the power supplies the others are using is current limited. You might want to check that. Consider what gets damaged if it fails.