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.
Thinking of ultra-simple rigs, perhaps consider my FETer. I was surprised how well this worked.
See https://sites.google.com/site/g3xbmqrp3/hf/feter-80m-qrpp-cw-transceiver
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