Wow, your traces look a lot nicer than my traces did! You did a great job there. Thank you so much! I have some questions though. What are the purposes of the round Via's next to the SMD caps, C2, C3, C4 and C5? Also, I have a fancy soldering station now, a Weller (pronounced Veller) WX2 with a micro soldering iron so smaller SMD packages aren't really a problem anymore. With that being said, is there a reason R2 is still a through hole resistor? It's the 16 ohm one. Can that be replaced with an SMD type resistor, like R3, R4 and R5? Also, can I replace the diodes, D1 and D2 with something like this:
http://www.digikey.com/product-detail/e ... -ND/789335 It's a SMD version of the through hole 1N4148 diode. I also have some hot air rework station made by Weller too. It's an older model though. Still works great though. And does C1 still have to be through-hole or could I use something like this:
http://www.digikey.com/product-detail/e ... -ND/396321
Also, for the trimmer potentiometer, I was thinking something like this:
http://www.digikey.com/product-detail/e ... ND/1089395
The caps for the voltage regulators, they're called filter caps, right? And their purpose is to just clean up the input and output going to and from the voltage regulators? Blocking AC and stuff like that, right? Would adding a fuse to the timer board be pointless if the power supply has one or would it be a good idea? I remember in college, when I was in a PC lab, the teacher asked me to get a PC working, for a challenge. I stripped it down, put it back together, and when I hit power, the motherboard started smoking. I believe the power supply broke and was throwing AC voltage at the board instead of DC. It was kind of cool but a bit embarrassing. I should've checked it with a PSU tester first. The teacher said he was glad I didn't because it would of ruined his PSU tester but I think he was just trying to make me feel better.