Confusing about grounding, please help

goldkenn · 20th August 2008, 10:50 AM

As the RCA sockets are insulated from chassis, if a preamp PCB without onboard PSU, but layout already connected the signal ground and voltage input ground together, do I still need to have gounding the signal at sockets, to chassis directly or maybe via a small cap? Or, I only need to ground the power ground, to chassis or the mains earth from the outboard PSUr??

AndrewT · 20th August 2008, 11:00 AM

Hi,
the exposed conductive parts must be connected to Safety Earth in all of our mains powered equipment.

If it's not mains powered and not connected to any mains powered equipment then Safety Earth compliance is not required.

goldkenn · 20th August 2008, 11:27 AM

Maybe I should ask in this way;

A preamp with regulated PSU, I should only ground to the mains earth/chassis at the regulator will be fine? Or I should also ground the signal?

AndrewT · 20th August 2008, 12:27 PM

is it mains powered?
and is it connected to mains powered equipment?

goldkenn · 21st August 2008, 04:03 PM

Quote:

Originally posted by AndrewT
is it mains powered?
and is it connected to mains powered equipment?

yes

AndrewT · 21st August 2008, 04:20 PM

you must Safety Earth all/any exposed conductive parts.

Flow and return of signal & power are a completely separate issue.

20th August 2008, 10:50 AM	#1
goldkenn diyAudio Member Join Date: May 2005 Location: HK	Confusing about grounding, please help As the RCA sockets are insulated from chassis, if a preamp PCB without onboard PSU, but layout already connected the signal ground and voltage input ground together, do I still need to have gounding the signal at sockets, to chassis directly or maybe via a small cap? Or, I only need to ground the power ground, to chassis or the mains earth from the outboard PSUr??

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
confusing transformer connections	audio_moksha	Tubes / Valves	0	13th March 2008 03:07 AM
WE310A, a confusing issue	Kenneth Zhu	Tubes / Valves	1	9th December 2006 02:24 PM
confusing capacitor value	wim	Parts	10	28th February 2005 03:23 PM
a resistor in input circuit is confusing me	john-china	Pass Labs	2	15th September 2003 08:27 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th August 2008, 11:00 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the exposed conductive parts must be connected to Safety Earth in all of our mains powered equipment. If it's not mains powered and not connected to any mains powered equipment then Safety Earth compliance is not required.

20th August 2008, 11:27 AM	#3
goldkenn diyAudio Member Join Date: May 2005 Location: HK	Maybe I should ask in this way; A preamp with regulated PSU, I should only ground to the mains earth/chassis at the regulator will be fine? Or I should also ground the signal?

20th August 2008, 12:27 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	is it mains powered? and is it connected to mains powered equipment?

21st August 2008, 04:20 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	you must Safety Earth all/any exposed conductive parts. Flow and return of signal & power are a completely separate issue.