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Old 25th March 2013, 06:06 AM   #11
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Ok, thanks everybody! I was understand what you are tell me.

I found Magtech Amplifier - the Hi-end equipment (from Sanders Sound System). It's seem like layout PSU with ''T-ground'' (3). With 4 filter caps per rail. Chassis ground connected at star ground.

It's means the (3) way was not bad. I wonder why, how they do it?
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Old 25th March 2013, 10:47 AM   #12
DF96 is offline DF96  England
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Assuming what you say is true, then a poor design can sometimes be improved by over-engineering. For example, a ground connection carrying charging pulses in series with signal voltages can be improved by making it short and thick so it has low impedance. The correct solution is to separate charging pulses from signals, then you can use thinner conductors.

Don't assume that popular, highly praised commercial equipment (even so-called 'high end') is competently designed. Sometimes it is; sometimes it isn't. In fact, I would say that one of the signs that someone is beginning to really understand electronics is when he can spot errors in some commercial circuits.
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Old 25th March 2013, 01:42 PM   #13
PMI is offline PMI  United States
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Quote:
Originally Posted by Walkalone View Post
It's means the (3) way was not bad. I wonder why, how they do it?
Different approach from what is usually recommended here... two layer PCB, large and wide, with big power and ground planes. More like what you would see in industrial application. Also seems to be an extra skinny trace to balance something else in the circuit. Most people who post here, assume single layer boards.
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Old 25th March 2013, 06:23 PM   #14
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Bonsai - a member of our forum. He have a project, they're look very professional, called is ''e-amp''. Their PSU is used ''T-ground'' that i said.
http://hifisonix.com/wordpress/wp-co...-Amp_V2.03.pdf

I'm really confused. What's the best way?

My plan is create a PSU with 8 ultra fast diodes (Ixys DSEI60-02A) or general diodes like GBPC3504 and about 20 filter caps for my next project. It's not necessary monoblock, although they are better.
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Old 25th March 2013, 08:22 PM   #15
DF96 is offline DF96  England
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I don't know what you mean by "T-ground"; it is not a term I am familiar with. However, the amp you linked to seems to do PSU grounding correctly. For some reason the designer decided to run the reservoir caps strictly in parallel rather than as a ladder. Not the way I would do it, but given his decision he seems to have correctly implemented it.
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Old 26th March 2013, 03:58 AM   #16
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''T-ground'' is simply called by me. Maybe its means that the ground connection of the caps, circuits by separate tracks. So formed like the ''T'' letter.
I think, with ''T-ground'' many caps each pos. rail or neg. rail would be equivalent to only one cap.

I used the usual way, with total under 8 filter caps. They're good and simple in Layout.
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Old 26th March 2013, 05:57 AM   #17
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I'm attack the schematic, illustrate for what i said.
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Old 26th March 2013, 10:46 AM   #18
AndrewT is offline AndrewT  Scotland
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Do NOT use the junction of the smoothing capacitors as the Main Audio Ground (MAG).

Place the MAG at the amplifier/s and take all the references to that MAG location.
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Old 26th March 2013, 10:51 AM   #19
AndrewT is offline AndrewT  Scotland
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Connect the -ve of upper bridge to C1.
Connect the +ve of lower bridge to C2.
Connect Cpos.n to Cneg.n
Connect this last Zero Volts link to the MAG.

You almost have a MAG in your diagram. Look at where Speakers Return meets Signal GND and nearly meets Main circuits GND
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Last edited by AndrewT; 26th March 2013 at 11:17 AM.
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Old 26th March 2013, 12:52 PM   #20
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Andrew, can you tell again by show a pic?
I'm Asian, EngLish is not main language. Therefore, difficult to understand the problem.
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