Introooducinggg micro45/85! (Unofficially the smallest arduino compatible dev board) it features usb, bread board compatibility, power filtering/ power led! All under 1inch in every dimension. : r/arduino
New TEA5767 Sketches to Make an FM Radio with Arduino - Arduino Project Hub
GitHub - MCUdude/MicroCore: A light-weight Arduino hardware package for ATtiny13
FM Radio Using Arduino and RDA8057M - Arduino Project Hub