Noise Filter Ground
Jul 25
2010
2010
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Which line do I install a noise filter in my car stereo, +12v or ground?
It probably shouldn't matter, since it's connected in "series" with the radio. "Noise filters" use capacitors, which block the AC ("ripple") component in the current, and allow the DC component to pass, but it's probably better to connect it to the +12V side, the stereo chassis might be grounded. ("Back in the day," car dashboards were all metal, so the radio chassis was grounded directly to the dash. Most cars today have a plastic dash, so they need a ground wire.)
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