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Old 23rd April 2005, 07:25 AM   #1
ex192 is offline ex192  Germany
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Question Location of rectifier bridge?

I plan to build an amplifier based on the audiosector LM3875 kit with an external power supply.

Are there any disadvantages placing the rectifier bridge in the chassis of the amplifier instead of placing it in the power supply chassis?

Thank's for any comments.
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Old 23rd April 2005, 08:43 AM   #2
Nuuk is offline Nuuk  United Kingdom
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I've tried both and it doesn't seem to make any difference!

When I put it in the remote PSU casing, I add some smallish (120 uF) caps to the rails.
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
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Old 23rd April 2005, 08:35 PM   #3
sek is offline sek  Germany
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EMI would certainly be an issue. But for the sound quality of the amp it should make no difference.

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Old 8th May 2005, 03:40 PM   #4
AndrewT is offline AndrewT  Scotland
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maybe a bit late for input here.
when you separate the PSU from the amp keep the AC with the transformer and maintain DC inside the amp enclosure.
That means rectify and smooth inside the PSU. Then run DC lines to amp. More smoothing inside the amp and decoupling on the rails will help again.
I believe local smoothing and rail decoupling will affect the final sound quality of the amp.
Now my question.
All the decoupling (and local smoothing) should run on separate return lines to the master ground.
All signal returns should also run on separate lines to the master ground.
Where do you put the master ground? In the amp or in the PSU?
My preference is in the amp and run a PSU ground to the master ground (star earth).
The safety ground is only needed in the PSU and can be resistor connected to the PSU ground.
regards Andrew T.
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