How to Eliminate Relay Noise in Audio Systems > 자유게시판

Clicks and pops caused by relay operation can be a persistent challenge that introduces clicks, pops, or unwanted electrical interference into your audio output. This interference typically occurs when mechanical relays switch on or off, causing sudden changes in current flow that couple into sensitive audio circuits. While relays are ideal for isolating high-voltage circuits, their mechanical nature makes them prone to generating electrical transients.

To reduce relay-induced interference, start by picking a relay suited for audio use. SSRs are often a preferred solution for audio because they have no moving parts and switch more smoothly, minimizing transient generation. If you must use a electromechanical switch, select one with a optimized winding design and consider using a snubber circuit—a simple resistor and capacitor in series—across the relay coil to absorb switching transients generated during switching.

Additionally, ensure effective earth bonding and EMI containment. Keep relay circuit traces away from low-level input circuits and use twisted pair or shielded cables where possible to reduce RF coupling. Place the relay as far as practical from mic and line-level inputs, and consider adding a small ferrite bead on the relay power line to filter high frequency noise.

Power supply filtering is also essential. Use bypass capacitors near the relay’s power input and consider a dedicated clean power rail for the audio section. Finally, implement digital timing delays if the relay is activated via digital logic, so that switching happens during natural pauses between tracks.

By combining these techniques—selecting the right relay, filtering transients, isolating signals, and delaying activation to silent moments—you can effectively suppress switching artifacts and maintain clean, انواع رله professional audio quality.