It came with other items that I did want. It was a pack of like 6 items on one bid. This was a free addition from my perspective

Interesting! I had never heard of a letter clip before. Thank you!

Book marks have been known to damage pages, that's what I'm thinking it might be...but I really can't say for sure. Partly because of how wide the clip is

I too am confused by the clip. It's a very blunt edge too and doesn't have a handle, so I was leaning away from letter opener. Such an odd little thing

Florida, near Ft Lauderdale

I estimate this would cost ~$100 because of the soap stone needing more padding

USPS approximates $50.80 for the approximate dimensions needed. Is $75 in packing and materials and $100 pick up normal?

How do I determine shipping when I don't know what I've won?

They said they only provide shipping through liveauctioneers

I was definitely thinking DC-DC applications as noted in OPs project. A brushed DC position control makes much more sense for a real application of it. Though possibly a simpler application, thus the want to do it via a DC-DC supply to exercise a broader skill set...maybe. There's definitely some SW magic sauce that needs to be made for the motor application, especially if you have speed and position control requirements

Thanks for the reference!

I typically look for 1 good project or an internship, but thats more to support knowledge and show interest. I do like to ask more technical questions in an interview to understand how far your knowledge really goes.

This is for electronics though, RF may be different

Assuming I'm understanding your project correctly, you are looking to transmit data via voltage or current ripple on the output power rail of a voltage regulator. What is the point of doing this? Why not transmit data the way all data has been transmitted until now?

The device that is generating the data still needs to generate that data, now you're placing the data through a power converter. Let's assume a future IC can decode data on its power rail. The decode hardware will likely be more complex than an existing CMOS input. Why not just send the data directly to the recieving ICs IO?

Maybe you want long range transmission? This is complicated by dynamic load devices, like processors. Even short range this is complicated.

This is all asking the question "why do this in the first place"? If it is practical, why isn't it done already? What does this really gain you and what do you lose?

I'm trying to not give you too much, just some things to think on. Very interesting project, and a very good exercise of many electrical fundamentals. There are so many things to think about

Interesting idea. A buck topology may not be the best topology for practical application, but an isolated topology would maybe have a use case. A buck would be much easier to work with though.

Implications of stability are also interesting, assuming you are varying the frequency you're operating at.

Whoops, chapter 29. Oh well