How to connect electrostatic shield of power transformer?

bee696 · 22nd July 2005, 02:01 PM

I got a power transformer with electrostatic shield, should I connect it to signal ground or AC ground (i.e. the ground of AC socket)?

Btw, I connect 0.1uF cap between the signal and AC ground.

Thanks!

Gluca · 22nd July 2005, 07:17 PM

I connected it to ac ground and my star ground is connected there too (no cap). I have no hum (but it depends also on other facts I guess).

Ciao
Gianluca

nafunga · 22nd July 2005, 07:54 PM

Electrostatic screen is normally connected to the supply earth.

bee696 · 23rd July 2005, 08:26 AM

Thanks all!!!

Johan Potgieter · 23rd July 2005, 10:54 PM

Should not matter. Such a screen is there to bypass spikes and higher frequency rubbish to earth before it can enter the system via the secondary (power) windings. It works like a capacitor, and all your earths are normally at "earth potential" as far as this is concerned. (Perhaps, if you have a particularly noisy mains, you might want to try different points.)

22nd July 2005, 02:01 PM	#1
bee696 diyAudio Member Join Date: Jul 2005 Location: Thailand	How to connect electrostatic shield of power transformer? I got a power transformer with electrostatic shield, should I connect it to signal ground or AC ground (i.e. the ground of AC socket)? Btw, I connect 0.1uF cap between the signal and AC ground. Thanks! __________________ Bee696

23rd July 2005, 08:26 AM	#4
bee696 diyAudio Member Join Date: Jul 2005 Location: Thailand	Thanks all!!! __________________ Bee696

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22nd July 2005, 07:17 PM	#2
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	I connected it to ac ground and my star ground is connected there too (no cap). I have no hum (but it depends also on other facts I guess). Ciao Gianluca

22nd July 2005, 07:54 PM	#3
nafunga diyAudio Member Join Date: Jul 2005 Location: Whitstable , Kent. UK	Electrostatic screen is normally connected to the supply earth.

23rd July 2005, 10:54 PM	#5
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Should not matter. Such a screen is there to bypass spikes and higher frequency rubbish to earth before it can enter the system via the secondary (power) windings. It works like a capacitor, and all your earths are normally at "earth potential" as far as this is concerned. (Perhaps, if you have a particularly noisy mains, you might want to try different points.)

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