grounding question

skyraider · 9th March 2004, 08:54 AM

hi guys,
i need advice here. I often heard 'power ground' and 'signal ground'. What does it means? I usually just ground everything to a single point. I thought ground is just a sink for all the currents to flow? Why is there two ground points?
thanks!

Ropie · 9th March 2004, 09:12 AM

This is a very well covered point, but two grounds are used to separate the signal current from the power source. The two grounds are then linked together (with a thin wire to help prevent the larger power current flowing back and infecting the signal ground).

Most people building gainclones use two grounds per channel as the power star ground should be placed as close to the 1000uF caps as is humanly possible, as this keeps the signal path short and makes for a better sounding amp.

Look at any schematic for details of which point to connect to which of the two grounds.

9th March 2004, 08:54 AM	#1
skyraider diyAudio Member Join Date: Jan 2004 Location: malaysia	grounding question hi guys, i need advice here. I often heard 'power ground' and 'signal ground'. What does it means? I usually just ground everything to a single point. I thought ground is just a sink for all the currents to flow? Why is there two ground points? thanks!

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9th March 2004, 09:12 AM	#2
Ropie diyAudio Member Join Date: Jul 2003 Location: SW London	This is a very well covered point, but two grounds are used to separate the signal current from the power source. The two grounds are then linked together (with a thin wire to help prevent the larger power current flowing back and infecting the signal ground). Most people building gainclones use two grounds per channel as the power star ground should be placed as close to the 1000uF caps as is humanly possible, as this keeps the signal path short and makes for a better sounding amp. Look at any schematic for details of which point to connect to which of the two grounds.

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