Crystal Radio.pdf and Transistor Radio

I found this on the internet. I thought he did a nice job describing different approaches to crystal radios and transistors.
Check out my other uploads for my version of the radio with amplifier. I make the variable capacitor from cardboard and aluminum foil, his design uses a dial version variable capacitor which is store bought. One thing I do like is the real McGyver approach to the diode. He talks about other common things you can use instead of a diode, like a rusty blade and pencil graphite, which is what guys used in WW2 and WW1 according to him to make a simple radio.
I also like his explanations and his amplifiers. The links to his site are in the document so you can reach it anytime. I just took his web pages on the subject matter and made them into a pdf. Look at my other uploads for more material.