So, here is my latest design, basically it’s a USB stick that you plug into your computer and automatically starts broadcasting your music throughout the FM radio. In other words: Plug and play.
It features Play, Pause, Stop, Next, Previous, Volumen + and Volumen – controls. And it works in any OS. No drivers required.
The carrier frequency can be adjusted using a variable coil. It can transmit between 88MHz and 108MHz. It drains its power from the USB but an additional amp can be plugged into the antenna output to increase the transmitter power and therefore obtain a greater range.
The schematic: HERE
All files: HERE
You can buy the PCB: HERE