This circuit originated in Brazil. Here it is on the DXexplorer site. I think it has been on this blog some time ago.
See https://www.qsl.net/py2ohh/trx/pititico/pititico.html .
Incidentally, PY2OHH's site has a wealth of data.
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.
Buy me (a virtual) cup of coffee
This is NOT at all compulsory, but this would help offset some project costs.
Any donations most gratefully received.
https://ko-fi.com/rogerg3xbm
Any donations most gratefully received.
https://ko-fi.com/rogerg3xbm
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Featured post
Heathkit QRP HW8 CW transceiver
You may recall I bought a much modified HW8 some weeks ago. If I could find my CW key I might use it on TX! This video is years old. In it...
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