The FM transmitter circuit itself is based off one of [Art Swan]’s builds, but instead of the solderless breadboard construction you would expect to find in a small demo circuit, [Angelo] went ...
testing two popular 555 transmitter circuits. One uses the control voltage pin to input the audio signal, while the other uses the reset pin. The CV-pin version worked slightly better, but it was ...
More information: A Power-Efficient CORDIC-less Digital Polar Transmitter Using 1b DSM-Based PA Supporting 256-QAM. Session 5: Front-End Circuits for High-Performance Transceivers.