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Old 7th March 2014, 10:45 AM   #21
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I don't know if you've heard of the UKs Compliance Club..

Its a journal of EMC/EMI related material ,with many contributions over the years by Keith Armstrong and other such luminarys. A must have resource.

There are over 100 originally printed issues that you can download in pdf form , and earthing,grounding and shielding of PCBs and ancilliaries are its bread and butter.

EMC Information Centre

You may have to register to gain access , but its free and they do not spam given email addresses.

Rob
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Old 7th March 2014, 11:17 AM   #22
Bonsai is offline Bonsai  Taiwan
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Firstly, have you checked that your input sockets are not shorting to the chassis (disconnect the input wires and measure).

Both the 0V and the PE must connect at one place only on the chassis

For the small signal stuff you have two options

1. Place a 10 ohm resistor between the signal ground and the power ground on the PCB. The input signal ground connects onto the PCB ground only.

2. The second option it to leave the 10 ohm resistor in place, but run a connection from the input socket ground to the star ground on your PCB.

These techniques usually solve most problems. However, not all consumer equipment is faultless.
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Last edited by Bonsai; 7th March 2014 at 11:31 AM.
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Old 8th March 2014, 03:50 AM   #23
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Quote:
Originally Posted by MrSleepy View Post
I don't know if you've heard of the UKs Compliance Club..

Its a journal of EMC/EMI related material ,with many contributions over the years by Keith Armstrong and other such luminarys. A must have resource.

There are over 100 originally printed issues that you can download in pdf form , and earthing,grounding and shielding of PCBs and ancilliaries are its bread and butter.

EMC Information Centre

You may have to register to gain access , but its free and they do not spam given email addresses.

Rob
Wow, LOTS of good stuff here. They suggest connecting a CM choke just like I described. Reading through the articles will help to give you a sense of what the dangers of EMI are, what is susceptible and how to immunize your circuits/appliances.
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Old 10th March 2014, 02:17 AM   #24
BigE is offline BigE  Canada
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I am unfamiliar with the terms signal ground and source ground. Would this sit inline on a single ended input?
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Old 10th March 2014, 02:24 AM   #25
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Source ground is the ground at your source's output. Signal ground is the ground at your amp's input. This is for unbalanced connections. Balanced connections would need a 3-winding CM choke, but they are expensive, exotic and it's arguable whether they would improve a balanced connection.
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Old 10th March 2014, 10:15 PM   #26
BigE is offline BigE  Canada
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Thanks.
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