My Arduino project requires intermediate soldering skills. Having little experience in this area, I decided to practice first with a $15 headphone amplifier kit. This is a short demo shows the end product of the kit and my amp in use. I still need to put in a project box, but it's fully functional as is.
A couple things I learned:
1) Clear tape is great for securing components to the PCB while you're soldering. I also used tape to temporarily secure the PCB board to a breadboard for stability.
2) It's WAY easier to solder components to the PCB, than soldering wires together or leads to headers. I had the hardest time soldering the battery wires and capacitor to the header posts in this kit.
3) Always have a solder sucker on hand for mistakes or connections you don't trust.
4) This amp will boost any output volume to dangerously high levels. It goes to 11 and it is LOUD.