I am rather new to the DIY/hobbyist electrical engineering scene. I am working with an arduino, a 9V power supply, and a few 7805 voltage regulators. I bought some sort of run of the mill PCB board with many many copper squares and pin holes on it, and I have been using that to construct my project. In the end I am trying to drive up to about 100 LEDs.
The copper squares on the pcb board seem really close. And yes, I am sure the wiring/soldering job I have done is rather horrid, but I have a limited budget and knowledge.
What I would like to know, as I have had a hard time tracking down an answer, is whether or not my solder joints and the contacts of my various components are too close together and I am risking a situation where an arching might occur. I am really not all too sure on how much distance it takes for 5 volts to gap. So far I haven't had any issues, but since I want to make a gift for someone I care about, making sure its relatively safe for them to possess would make me feel comfortable giving it to them.
I have linked to two pictures, one of the underside of my board, and the other of the side of the board with the 7805s in sight, so that hopefully some rough idea of scale here is possible.
Thanks much in advance!