The following schematic shows a Simple Wireless Headphone Circuit Diagram and Design. This Wireless Headphone Circuit Design is basically a simple FM transmitter housed in a plastic or metal enclosure.
Using an RCA-to-RCA cord, connect the audio output of your TV to the transmitter’s input. Adjust the gain of the audio preamplifier with the help of preset VR1 for clear reception in a portable FM receiver equipped with an earphone socket. Use a good-quality earphone.