Most radio circuits are tuned to pretty close tolerances and going from 27 MHz to 50 MHz seemed like quite a leap. The answer? An Arduino and a few other choice pieces of circuitry.

[Mark VandeWettering] was experimenting with a simple transmitting circuit and an Arduino. The circuit in the project was designed by [Steve Weber] to broadcast temperature and telemetry data using… ...

London has a rich history of underground radio stations, but what if we flipped that, and turned London's Underground into a radio? Well it'd look like this. The circuit-board radio project is a ...