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Old 27th December 2012, 11:03 AM   #71
AndrewT is offline AndrewT  Scotland
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similar mistake in post67.

Multiple grounding creating loops.
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Old 27th December 2012, 12:10 PM   #72
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no.

You have connected the centre tap to all three PSUs.
This means you cannot later connect the audio grounds together without creating a ground loop.

BUT your linked PSU centre tap carries charging pulses. This is a contaminated ground.

Do not do it your way.
Thank you Andrew for your wise explanation.
I have not implemented that after I found a lot of hum appeared due to the "contaminated ground" in that connection, as you have very aptly pointed out.

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similar mistake in post67.

Multiple grounding creating loops.
I am now using a common PSU for the Equalizer, Preamp and the X over and another for the Power Amplifier section which is now isolated and placed on a wooden board for the time being.

And interestingly, there is no hum or any kind of noise even after a continuous running of some 12 hours. I am just trusting my ears as I have no oscilloscope or other tools to identify the noise figure if any.

So I want to continue with this arrangement until A problem occurs.

But still I want to know what, according to you, is the ideal Power supply arrangement in this case? Do you recommend individual transformer for each section?

Thank you so much again for your valuable words.



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Old 27th December 2012, 12:33 PM   #73
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Main Audio Ground (MAG).
ONE and only one MAG
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Old 27th December 2012, 12:35 PM   #74
AndrewT is offline AndrewT  Scotland
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........................
I have not implemented that after I found a lot of hum appeared due to the "contaminated ground" in that connection, as you have very aptly pointed out. ...............
Yet you left that post there for all to see and commented that you had completed your project.

Do you expect that some Members read both posts and would copy what you posted?

Tell them what does NOT work is just as important as telling them what does work.

TELL THEM !!!!
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Old 27th December 2012, 02:58 PM   #75
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Main Audio Ground (MAG).
ONE and only one MAG
Thank you Andrew.

Quote:
Originally Posted by AndrewT View Post
Yet you left that post there for all to see and commented that you had completed your project.

Do you expect that some Members read both posts and would copy what you posted?

Tell them what does NOT work is just as important as telling them what does work.

TELL THEM !!!!

Andrew,
I definitely posted my working PSU connection at post #67 that worked nicely in my case.

I asked this question to all earlier ( at post #63) whether it was possible or not. And since sometimes realtime conversation don't take place here, it took me some time to get a reply from Sudhir (who was the first to reply). Sudhir suggested that using single transformer is not a good idea.

Meanwhile, before that, I, being impatient, gave it a try and found that as a bad solution and posted my working PSU arrangement at post #67.

So I posted what WORKED for me, I think at post#67.

And more, the circuit from that site contains a power supply onboard and as I said earlier, it is very well documented. So this personal question of mine is simply redundant to anyone unless one wants to bulild a single PSU for Eq, Preamp and X-over.

And regarding my leaving the post there, I cannot edit my posts after 30 mins or so I guess.

Yes, the project is finished and I have been listening to it and "loving it".
Sorry for any confusion that occured on your part.

Last but not the least, with due respect to your experience and wisdom, I would prefer a patient "Tell them!" instead of "TELL THEM!!!!"

Thanks.
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Last edited by csom; 27th December 2012 at 03:24 PM.
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Old 27th December 2012, 05:12 PM   #76
AndrewT is offline AndrewT  Scotland
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Quote:
but a Hum appeared in the sound.
I missed this.
Sorry, you did tell them.
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Old 27th December 2012, 05:16 PM   #77
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I missed this.
Sorry, you did tell them.
No problem Sir ))
It happens to all of us
Anyway, thank you really for helpful suggestions and guidance, keep them coming, I need them
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Old 27th December 2012, 06:54 PM   #78
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Okay, here is the complete arrangement of my amp that is performing impeccably with only two transformers for me, in my case, since last 24 hours or so.

No hum, no hiss, no unwanted noise, very quiet as usual.
Attached Images
File Type: jpg Working setup using two transformers.jpg (128.9 KB, 205 views)
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Old 29th December 2012, 08:05 PM   #79
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Smile Here is the real thing right at this moment.

Still lot of works, lol!

Any DIY suggestion for the front plate ? Please feel free to suggest/guide me
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File Type: jpg Photo of the amps and xover in a metal cabinet v1.jpg (749.7 KB, 184 views)
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Old 2nd January 2013, 05:45 AM   #80
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Still lot of works, lol!

Any DIY suggestion for the front plate ? Please feel free to suggest/guide me
Please share you speakers / entire setup photo also.
sudhir
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