Homework 8 hints ...

I figure you want to get this out of the way before the break ...

Full-wave rectifiers:

http://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/rectbr.html
http://www.eecs.tufts.edu/~dsculley/tutorial/diodes/diodes3.html
http://en.wikipedia.org/wiki/Diode_bridge

Diode protection:

http://www.coilgun.info/theory/inductivekickback.htm
The electronics bible

Audio crossover:

http://en.wikipedia.org/wiki/Audio_crossover

Filters:

http://www.play-hookey.com/ac_theory/lo_pass_filters.html

and links within. play-hookey.com is great for learning about practical circuits.

Inductive and capacitive coupling:

http://www.thinksrs.com/downloads/PDFs/ApplicationNotes/AboutLIAs.pdf

Look at page 7, you should recognize the figures. The rest is a bit hardcore, and not directly relevant. I think you might find the first page or two interesting, though, if you have time to kill. I'm happy to explain what a 'lock-in amplifier' is if you are curious ... I use them daily.

Using the internet to do your homework is fair game, copying verbatim is not. Restate things in your own words, at the least. I picked the problems for a reason, namely, that I think they illustrate important concepts that you will find useful at some point. [1]

[1] For example, an MRI magnet is a giant inductive load, hence problem 10. Understanding audio electronics is nice, hence problems 1,2, 7-9. Problem 3 is something you put into practice every time you plug in your laptop or charge your ipod. Etc.