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Audio Component Grounding and Interconnection
Audio Component Grounding and Interconnection
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Old 24th March 2012, 01:33 PM   #31
merlin el mago is offline merlin el mago
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Indispensable article, I newbie like me understood perfectly.
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Old 30th April 2012, 06:10 PM   #32
sjs is offline sjs  United Kingdom
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Very nice article, simultaneously clear and comprehensive, which is some feat.

In 4.7 you cover grounding transformers e.g. AC mains transformer frame to safety ground, and tube output transformer isolated from the chassis and the frame attached to the power common, and secondary -ve to power common. It could be useful to also cover other common ironwork on tube amps, such as HT chokes (frame to power common?), anode choke load (frame to power common?), interstage transformers (frame to power common?) etc.
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Old 7th May 2012, 01:45 PM   #33
David Davenport is offline David Davenport  United States
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Good point - I'll keep this in mind for a future update.

Dave
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Old 14th August 2012, 08:18 PM   #34
billyfromthehil is offline billyfromthehil  United States
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I never knew that I knew so little of all there is to know about Grounding equipment.
After hooking up an Active crossover incorrectly and blowing an amplifier after power up while adjusting cross over frequencies I began to take a serious look at the issue of Grounding.
Before -in my audio world, everything just worked out but I was typically only hooking up consumer grade home audio units.
As I have gotten into vintage tube gear and pro audio equipment the need for knowledge has increased far beyond my ability to consolidate all the theories into one place and create a meaningful and (somewhat) concise overview. This article has done that. I found it after scouring the Web - Rane, Peavy and other sites for bits and pieces. This ties much of the needed info together in a meaningful way without too much painful maths.

RANE has some great articles on grounding. Specifically concerning Cables and what should be done at the termination RCA to 1/4" or XLR depending on the type of equipment involved.

Thanks for taking the time to put this together
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Old 6th September 2016, 04:42 PM   #35
SandroN is offline SandroN  Brazil
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Default Help with hum

My SE amp (L' Amp - http://www.diyaudio.com/forums/diyau...-part-1-a.html) was done with star-grounding. Transformer has 2 secondaries, so I've built 2 PSU (1 for left and 1 for right). Their ground go to star. RCA shield from each channel input and its bias ground go to local references (source of FET).
- With inputs shorted, the amp is super silent (mute).
- With open inputs, almost mute.
- With RCA cable + open ends, almost mute.
- With RCA cable + 2k resistor in each end, mute.
- If the resistors at RCA end (left and right) share the same "ground", audible hum is generated. This occurs with any source connected to the amp (CD player, DAC, etc) because their RCA shields are connected to ground.

Where is my error?

Obs.: I tried loop breaker to star point, earth to star, no earth, all without success.
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Old 7th September 2016, 07:13 PM   #36
David Davenport is offline David Davenport  United States
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Hello SandroN,

Two thoughts:

First, you might ask the folks who post to the L'Amp forum how they wired their amplifiers.

Second, Can you post a schematic diagram with the physical way you have the power and ground wired?

Dave
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Old 11th October 2016, 12:40 PM   #37
pattakosn is offline pattakosn  Greece
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Hi, I know I shouldn't be posting on a dead thread but I would like to say a big thank you for this article! In fact this is such a useful article that I would argue that this thread is always new!
Thanks again
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Old 24th December 2017, 05:57 PM   #38
cspirou is offline cspirou  United States
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Excellent post.

If I am building an amp around one of those class D modules from Sure or Yuan Jing with an external power brick, how do I deal with the chassis ground? Does everything just float in the chassis? Do I just connect the signal ground to the chassis?
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Old 25th December 2017, 03:25 PM   #39
David Davenport is offline David Davenport  United States
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I do not like to leave things floating, so connect the chassis to signal ground.
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Old 26th December 2017, 02:18 AM   #40
Davy Juvtmall is offline Davy Juvtmall
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So nice the article, thank you, it helps me a lot !
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