eie Posted December 14, 2004 Report Share Posted December 14, 2004 Switch with 2 select inputs have noise??do IC have noise?? Quote Link to comment Share on other sites More sharing options...
audioguru Posted December 14, 2004 Report Share Posted December 14, 2004 Hi Eie,If you switch between two inputs that have a different DC voltage, you will hear a "pop" noise, or see a flash on a video screen.Even if you switch between two audio sources that are capacitively-coupled and are grounded by a resistor, if one signal is positive at the moment when you switch to another one that is negative, you will hear a "pop" noise. Digital switches have a "zero-crossing" circuit to eliminate the pop.If you use a switch that is designed to switch a high mains current and has silver contacts that corrode, to switch low-level audio or video, then you will either get nothing or a lot of crackling noise and distortion. Switches with gold contacts (at very little extra cost) are designed for that application. Switches are also made with bifurcated contacts or with a wiping action (self-cleaning) for low-noise.Of course ICs have noise. If you use an old general purpose one like a 741 as a low-level microphone high-gain preamp, its output will have a constant "ssssssssssshhhhhhh" noise. If you use an IC that is designed for low-noise low-level audio or video, the noise will be so small you won't notice it. Quote Link to comment Share on other sites More sharing options...
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