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Old 4th January 2011, 04:23 PM   #31
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Audio Component Grounding and Interconnection
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Old 4th January 2011, 04:51 PM   #32
tomchr is offline tomchr  United States
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Quote:
Originally Posted by SGregory View Post
Safety.
And shielding. With the metal chassis grounded the field lines that terminate on the chassis set up a minuscule ground current. With the chassis grounded, these currents will flow to ground and not into sensitive circuits.

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Old 4th January 2011, 05:23 PM   #33
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Originally Posted by BrianDonegan View Post
This is getting pretty far OT and covered by a million other threads already, but...



Such devices typically tie post transformer GND (0V) to the chassis, then fuse the transformer secondaries. Device failure and somehow shorting to chassis would cause the fuse to blow. Tying the audio GND (common) to the chassis then also protects the device inputs/outputs from conducting higher voltages.
That wasn't my point.

Class II gear doesn't use the AC mains safety ground. Therefore, if the AC mains hot were to come into contact with the chassis, there's no return path back to neutral, the line fuse wouldn't blow and the chassis remains hot whether or not you have the power supply/signal ground tied to the chassis.

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Old 4th January 2011, 05:31 PM   #34
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Originally Posted by tomchr View Post
And shielding. With the metal chassis grounded the field lines that terminate on the chassis set up a minuscule ground current. With the chassis grounded, these currents will flow to ground and not into sensitive circuits.
Why would they flow to ground?

Shielding works in two ways, reflection loss and absorption loss. With reflection loss, the impedance mismatch between the interfering wave and the chassis causes the interfering wave to reflect off the surface, just like a signal in an improperly terminated transmission line gets reflected back to the source.

Absorption loss is due to eddy current losses in the chassis' metal.

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