Crystal Radio Follow-Up

On the heels of Sunday's note on a CR kit build and last week's copper penny CR, here's an article about of the other end of things, a Zinc Negative Resistance CW Transmitter over at the wonderfully named and yet sadly neglected http://sparkbangbuzz.com  This involves construction of the closest thing to a DIY transistor any of us are likely to see, so it's worth a look just for that alone.

sparkbangbuzz reads like a cross between a grimoire from a medieval alchemist's shop and a selection of tech reports from ACME Development Laboratories, but there is some heavy scientific lifting going on there.  Lots to investigate in the coming years.