Well, I may have to tune down my expectations for what I can do postwise during the semester. As for what I've made:
Monday I composed a new piece for the piano amidst the first day of classes.
Tuesday I was the first person to make a counter chip work in my digital electronics class.
Wednesday I made an even better counter on my off-class time, and got two of them working in parallel.
Today I figured out and planned an NPN-transistor only version of an XOR gate. Talk about using what you know! I used my knowledge from my discrete structures class to figure the logic, and I used my electronics knowledge to create the real design.
I don't know when I'll be able to post next, but hopefully it'll be tomorrow.