How to connect PSU board to amp board? - diyAudio
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Old 4th June 2011, 06:41 AM   #1
diyAudio Member
Join Date: Feb 2011
Location: Calgary
Default 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!
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Old 4th June 2011, 12:03 PM   #2
Join Date: Nov 2006
Location: Torpoint
It wont hurt and will help to keep them out of the way of signal cables.
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Old 4th June 2011, 12:33 PM   #3
AndrewT is offline AndrewT  Scotland
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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.
Sent from my desktop computer using a keyboard
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Old 6th June 2011, 07:51 AM   #4
! is offline !  United States
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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.
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Old 9th June 2011, 06:59 AM   #5
5162101 is offline 5162101  China
Join Date: Jun 2011
Ensure reliable connect Large enough wires
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Old 17th June 2012, 12:17 PM   #6
eduard is offline eduard  Netherlands
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I just did finish an outboard power supply for a soon to arrive virtue sensation amp which has just a positive and an ground/earth connection.
So technically 2 wires will be enough. The connector has 3 pins so i can twist the 2 wires and connect a shield to the third one. The distance will just be 40 centimeters or even less. The chassis of the outboard is grounded for safety reasons. Should i connect the shield to the ground as well and not connect it at the amplifier side?
Using solid cable from an old crossover '' coil ''
Just about to connect a power resistor to the supply to see if it will hold.
Thanks in advance, Edward
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Old 17th June 2012, 01:35 PM   #7
DF96 is offline DF96  England
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No need to shield power wiring as it will come from a low impedance source so capacitive coupling is not a problem. Twisting will help reduce magnetic coupling.
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