An Arduino Nano is charged with running the show, capturing audio via its analog-to-digital converter. A sensitivity pot enables the input level to be set appropriately.

The QN8066 is a fun little FM transmitter chip. It covers the full FM broadcast band and has built-in DSP. You would find this sort of part in car cell phone adapters before every vehicle included ...

It can be a scary prospect to go digging around your computer looking for specific files. Here's how to find Arduino libraries on Mac, PC, and Linux.