DC blocks are coaxial components that prevent the flow of audio and direct current (DC) frequencies while offering minimum interference to RF signals.

Applications include ground loop elimination, signal source modulation leakage suppression, system signal-to-noise ratio improvement, test setup isolation and other situations where undesired DC or audio current flows in the system.

One of their key applications is in eliminating ground loops, which are common sources of hum and noise in audio and video systems.

They can enhance the signal-to-noise ratio (SNR) in sensitive communication systems by preventing the intrusion of unwanted currents.

Additionally, DC blocks are used in test setups to isolate different parts of the system and prevent interference, ensuring more accurate measurements and maintaining the quality of the overall signal transmission.