Many thanks to SWLing Post contributor, Pete (WB9FLW), who notes that Ashhar Farhan (VU2ESE) has upgraded the BITX40 Transceiver with a Arduino Nano/Si5351 VFO:

http://www.hfsigs.com/

The BITX40 is an affordable, fully assembled QRP transceiver  we’ve mentioned on the SWLing Post before–click here to read more.

Thanks for the tip, Pete!