After an entire lecture i usually only take back one maybe two key points from it.  This page is where i will be posting some of them.

Information on how much power you can get from the USB port.

Have you ever needed to know how loud a piezo or other sound source was going to be at a distance other then the one that is quoted in the datasheet?  If so, this page is for you.  It’s a page i scanned in from a Star Micronics product catalog.