How to connect PSU board to amp board?

emerth · 4th June 2011, 06:41 AM

Should I twist the positive, negative and ground wires together in the run from the PSU board to amp board?

I am thinking of eg twisted pair Ethernet cable: twisting the wires reduces EMI broadcast from a signal/return pair.

Does this matter for an approx six inch power cable run (which is rather high current) - or am I being too paranoid?

Thanks in advance!

Andy5112405 · 4th June 2011, 12:03 PM

It wont hurt and will help to keep them out of the way of signal cables.

AndrewT · 4th June 2011, 12:33 PM

I have come to learn that all flow and return pairs must be of minimum loop area.

Twisted triplet for the PSU supply is my way only method.

! · 6th June 2011, 07:51 AM

The ideal is to use a shielded case and keep them away from a toroidal transformer. If you do that, there is no need to twist them. Twisted pair ethernet cable uses the twists because it is a high frequency signal while you (should be wanting) have as low a frequency ripple on your power rails as possible. Granted it is also for rejection of noise pickup but that is why you'd use a shielded case.

If you want to twist them, run two ground lines instead of one and twist positive rail with one ground and negative rail with the other, you don't want all 3 twisted together so that rail noise from one rail effects the other rail, in a shielded enclosure that should technically (although I'm not suggesting you can necessarily hear it audibly) be worse than not twisting them at all.

5162101 · 9th June 2011, 06:59 AM

Ensure reliable connect Large enough wires

4th June 2011, 06:41 AM	#1
emerth diyAudio Member Join Date: Feb 2011	How to connect PSU board to amp board? Should I twist the positive, negative and ground wires together in the run from the PSU board to amp board? I am thinking of eg twisted pair Ethernet cable: twisting the wires reduces EMI broadcast from a signal/return pair. Does this matter for an approx six inch power cable run (which is rather high current) - or am I being too paranoid? Thanks in advance!

4th June 2011, 12:33 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I have come to learn that all flow and return pairs must be of minimum loop area. Twisted triplet for the PSU supply is my way only method. __________________ regards Andrew T.

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4th June 2011, 12:03 PM	#2
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	It wont hurt and will help to keep them out of the way of signal cables.

6th June 2011, 07:51 AM	#4
! diyAudio Member Join Date: Jun 2005 Location: Midwest	The ideal is to use a shielded case and keep them away from a toroidal transformer. If you do that, there is no need to twist them. Twisted pair ethernet cable uses the twists because it is a high frequency signal while you (should be wanting) have as low a frequency ripple on your power rails as possible. Granted it is also for rejection of noise pickup but that is why you'd use a shielded case. If you want to twist them, run two ground lines instead of one and twist positive rail with one ground and negative rail with the other, you don't want all 3 twisted together so that rail noise from one rail effects the other rail, in a shielded enclosure that should technically (although I'm not suggesting you can necessarily hear it audibly) be worse than not twisting them at all.

9th June 2011, 06:59 AM	#5
5162101 Banned Join Date: Jun 2011	Ensure reliable connect Large enough wires

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