Inspired by "Hot Iron" edited by Peter Thornton GW6NGR I see reference to Rick Andersen KE3JJ. He has several very simple designs on his site.
See http://www.ke3ij.com/ .
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
Inspired by "Hot Iron" edited by Peter Thornton GW6NGR I see reference to Rick Andersen KE3JJ. He has several very simple designs on his site.
See http://www.ke3ij.com/ .
The 200mW beacon was turned on at about 1900z. UPDATE 1948z: Many spots of me by EA8BFK (2880km). At the peak I had about 28dB in hand!