If your FM transmitter is working correctly, you should be able to hear a feedback sound, which indicates that the device is transmitting a signal. This feedback sound usually occurs when the transmitter is operating within range of a receiver or when it is in proximity to a device that can pick up the signal, such as a radio.
For those interested in acquiring an FM transmitter, you can find a suitable model at https://www.buildcircuit.com/product/…. This product is designed for a variety of applications and comes with specifications and features detailed on the website, ensuring that it meets your needs for effective signal transmission.