Whilst browsing the Internet today I discovered a new video series by the AmateurLogic.tv guys.  Its called Ham College and focused at those new to Amateur radio.  Its aimed at the American amateur but, those parts aside, there is some excellent foundation content.

In the first episode they build a basic CW key and sounder then extend it to be a spark gap transmitter.  The second episode is about a crystal receiver.  Definitely worth watching but be prepared to skip around the bits that are not applicable here in the UK.

Andrew
G0RVM