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Old 16th December 2008, 05:36 PM   #1
sts9fan is offline sts9fan  United States
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Default Stereo Aikido GND help

Hello
I am tring to wrap my head around how best to ground my Aikido pre project to prevent any hum/noise. I am using the large stereo board. This is what I have been thinking but please let me know if I have no clue

The board has a GND that goes through a standoff. SHould I connect all input and out put gnds to this point?

I am using a Janus regulator whuch also has this type of gnd. What should I do with this?

I guess how the poersupply gnds and signal gnds relate is my issue...

Thanks for all the help
Kris
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Old 16th December 2008, 07:27 PM   #2
Stixx is offline Stixx  Germany
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Kris,

every amplifier only has one ground point (at least this is commonly said) --> have a look for star grounding (excellent article by Aikenamps somewhere on the 'net.

You can ground your amplifier through the standoff (metal of course ) and connect all other grounds to this point... or gather all psu grounds at one point and all signal grounds at one point that lead to ONE main grounding point that is connected to earth.

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Old 16th December 2008, 07:38 PM   #3
sts9fan is offline sts9fan  United States
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So that would be something like this all attached to chassis?



signal gnd point and power gnd point

both going to safety earth






You know I found those articles and they seem clear but I am still not 100% how signal and power connect.
So say I use the standoff gnd for the PS and main board. I would lead a wire from both of those to the earth gnd lug?

Thanks for the help
Kris
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Old 16th December 2008, 07:44 PM   #4
Brit01 is offline Brit01  United Kingdom
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Hi Kris,

I'm at the same stage and knowledge level with my 5687 kit. Almost ready to start assembling.

I was planning to take this ground point and make a ground bus with a thick copper tube in the chassis as my chassis will be made of wood.

My old apartment does not have good grounding points so I have to rely on the copper tube inside the chassis.
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Old 16th December 2008, 08:07 PM   #5
Stixx is offline Stixx  Germany
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Quote:
You know I found those articles and they seem clear but I am still not 100% how signal and power connect. So say I use the standoff gnd for the PS and main board. I would lead a wire from both of those to the earth gnd lug?
Either use a plastic standoff (aluminum base plate?) and run a wire from the Gnd point to earth....
or use a metal standoff, use the base plate as ground plane and connect the base plate to earth. Doing both (metal standoff connected to chassis and a wire) would form a ground loop.
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Old 16th December 2008, 08:14 PM   #6
sts9fan is offline sts9fan  United States
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got it! Which has a better chance of sucess?

Thanks
Kris
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Old 16th December 2008, 09:43 PM   #7
Renron is offline Renron  United States
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This one, kinda like a star grounding technique.

" use a plastic standoff (aluminum base plate?) and run a wire from the Gnd point to earth....?

Ron
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Old 17th December 2008, 12:24 PM   #8
Brit01 is offline Brit01  United Kingdom
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Hi Olle,

What kind of volume pot did you use?

I read that if I use a linear pot I should place a resistor (1/10 of the pot value) between the ground and out to make it more logarithmic.

50K pot ok?
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Old 17th December 2008, 04:05 PM   #9
Renron is offline Renron  United States
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Brit,
Olle is from the "other" thread....LOL, I though it was funny you posted here too.
50K for the "pot" might not be enough, it depends on the impedence and the MU of your set of tubes. In my case, (4) 6SN7 into a SS Conrad Johnson 250W Amp I'm using an attenuator from Dantimax with 100K Ohms. I have read some different threads on which is the recommended "pot" value and some that have tried the 50K said at the highest attenuation they could still hear music. Therefore I chose the 100K value.
I don't have enough experience to offer any advice, just stating what I did and what I read here on DiyAudio.com.
Find out what your MU is and do some more reading and (re)-searching the values others have used for the Aikido.
Let us know what you used.

Ron
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Old 17th December 2008, 05:04 PM   #10
Brit01 is offline Brit01  United Kingdom
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Hi Ron,

Didn't even realise I was in the wrong thread.

Trying to do too many things at the same time.

Crazy busy with a web applications project right now and an exam in 2 days. Got a zillion sessions open on my laptop which is smoking when trying to compile my code!!

I'm leaving the city this week so would like all the parts ready to assemble while I'm away for 2 weeks (somewhere where there are no electronic shops!0.

Cheers
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