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Old 23rd February 2013, 11:05 PM   #1
ridikas is offline ridikas  United States
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Default Transformer's Center Tap Connection

My chassis ground and signal ground are NOT connected with each other. The chassis is only connected to ground pin on the IEC.

Signal ground is in a star configuration and this is the spot where the transformer's center tap of the secondaries is connected to.

Should I connect this star ground point with a wire to the neutral pin on the IEC socket?

Otherwise I see three potential ground points:

1.) Transformer's primary at the neutral IEC pin.
2.) Floating signal ground's star configuration point on the circuit board.
3.) Chassis' ground point to the ground IEC pin.
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Old 23rd February 2013, 11:07 PM   #2
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I would connect the star ground also to IEC earth.

I definitely wouldn't connect it to neutral in case L+N get swapped at the plug !
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Old 23rd February 2013, 11:31 PM   #3
ridikas is offline ridikas  United States
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Quote:
Originally Posted by nigelwright7557 View Post
I would connect the star ground also to IEC earth.

I definitely wouldn't connect it to neutral in case L+N get swapped at the plug !
But what if I want to keep the chassis and signal ground separate?
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Old 23rd February 2013, 11:34 PM   #4
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Originally Posted by ridikas View Post
But what if I want to keep the chassis and signal ground separate?
Put a switch in.

I found with an MP3 player I needed the earth connected and when connected to a cd player or PC it wasn't needed and sometimes caused hum.

There are a few ways to get around the direct connection to earth.
Sometimes people use a capacitor to short out the noise to ground.
I have seen back to back diodes used too.
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Last edited by nigelwright7557; 23rd February 2013 at 11:38 PM.
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