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Chassis ground
Chassis ground
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Old 10th October 2018, 04:23 PM   #11
merlin el mago is offline merlin el mago
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Here Rod Elliot earthing the mains PSU to chassis.

Click the image to open in full size.

ValveWizard uses separate points to signal GND and safety mains AC earth, also says to take the input RCA signal ground to chassis in place of 1st cap mains AC filter PSU indicated in other places.

http://www.valvewizard.co.uk/Grounding.pdf

It's really so complicate to know what's the correct way, I'm puzzled.
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Old 10th October 2018, 04:51 PM   #12
scottjoplin is offline scottjoplin  Wales
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Best to connect the circuitry to the chassis at one point only in such a way that any fault current can be carried and blow the fuse or trip the circuit breaker before the wire burns away or any "lifting" circuit is destroyed.
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Old 10th October 2018, 06:34 PM   #13
Ben Mah is online now Ben Mah  Canada
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Hi merlin el mago, Scroll down to near the end of the long article that I referenced and there are diagrams that show grounding scheme, more specifically "Example #1 - Split Secondary Rectification with GND Lifter".

It is an example of solid state amplifier with solid state bipolar power supply but the grounding principles still apply.

From http://hifisonix.com/wordpress/wp-co...mplifier_3.pdf
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File Type: jpg ground.jpg (106.6 KB, 205 views)

Last edited by jazbo8; 11th October 2018 at 04:29 AM. Reason: formatting
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Old 10th October 2018, 07:31 PM   #14
merlin el mago is offline merlin el mago
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Interesting Jensen paper, not as the usually posted, specially page 13 showing how to test the kind of noise in page 13

http://web.mit.edu/jhawk/tmp/p/EST01...ps_handout.pdf

Well, done the test and result is no:

Common-impedance coupling in unbalanced cables (vast majority of problems)
Magnetic or electrostatic pickup by cable of nearby fields
Common-impedance coupling inside defective equipment

Grounding done as attached schematic of Rod Elliot.
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File Type: gif Ground Loop Breaker.gif (5.7 KB, 165 views)
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Old 10th October 2018, 10:14 PM   #15
Ben Mah is online now Ben Mah  Canada
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The diode bridge connection to ground in the diagram that you posted does not agree with the connection shown in the article that I referenced in my posts: Another ground lift connection: DC Servos

This is in agreement with the arrangement shown in my previous post and also as shown in the Valve Wizard article that you referenced in one of your earlier posts.
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File Type: jpg ground lift.jpg (110.0 KB, 151 views)
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Old 11th October 2018, 10:48 AM   #16
DF96 is offline DF96  England
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The safety ground connection to chassis and the signal ground connection must be two separate chassis connections. On that we should all agree.

The best place to make the signal ground connection depends on all sort of things, so if you are looking for a foolproof recipe I am afraid you might not find it. In the case of a power amplifier the input sockets may be a good place. For a phono preamp it could be the output sockets. For a line stage who knows?
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Old 11th October 2018, 11:26 AM   #17
merlin el mago is offline merlin el mago
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Thank you very much, your answer let me know all my questions.

N.B. Is a phono preamp so I will chassis grriund at the output RCA signal ground.

Quote:
Originally Posted by Ben Mah View Post
The diode bridge connection to ground in the diagram that you posted does not agree with the connection shown in the article that I referenced in my posts: Another ground lift connection: DC Servos

This is in agreement with the arrangement shown in my previous post and also as shown in the Valve Wizard article that you referenced in one of your earlier posts.
Here shows like Rod Elliot schematic:
How to Design and Build an Amplifier With the TDA2050 - Circuit Basics
EasyEDA - A Simple and Powerful Electronic Circuit Design Tool
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Old 11th October 2018, 07:32 PM   #18
russc is offline russc  England
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Audio Component Grounding and Interconnection - diyAudio
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Old 14th October 2018, 03:40 PM   #19
THD+N is offline THD+N  United States
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I have used this connection method for 20 years. It is easy and reliable. I happen to have a bag full of X2 caps with 4.7nF value, but anything from 4.7nF to 0.1uF will work well. I would recommend an X2 or Y2 cap for this.

I also ground the earth right at the input RCA signal ground or as close as you can to it.
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File Type: jpg Earth Ground_Signal Ground.jpg (4.9 KB, 64 views)
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Old 14th October 2018, 03:51 PM   #20
thimios is offline thimios  Greece
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I have repair 4 commercial amplifiers last month.
All these have 0v and safety gnd direct connected.
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