My "audiophile" LM3886 approach - Page 16

Russ White · 22nd July 2005, 05:24 PM

Its a slow Friday here at work, so I managed one more tweak.

Mostly just the power and GND traces. Especially signal ground.

carlosfm · 22nd July 2005, 06:19 PM

Quote:

Originally posted by Russ White
The main problem with a seperate PS board is you will always have some ground loop when you do so, especially if it is shared between channels.

No.
You don't.
Stereo, single or double (external) PSU:

Russ White · 22nd July 2005, 06:24 PM

Quote:

Originally posted by carlosfm

No.
You don't.
Stereo, single or double (external) PSU:

Yes, I admittedly mispoke, I have had a conversation with Carlmart about this as well. While it is possible to avoid "ground loop" it is certainly not without it's own challenges and compromises.

carlosfm · 22nd July 2005, 07:31 PM

Quote:

Originally posted by Russ White
While it is possible to avoid "ground loop" it is certainly not without it's own challenges and compromises.

There are advantages and disadvantages, as usual.

Russ White · 22nd July 2005, 08:28 PM

Quote:

Originally posted by carlosfm

There are advantages and disadvantages, as usual.

If only we could create a situation with only advantages.

maf_au · 23rd July 2005, 05:08 PM

Hi.

Has anyone built a case for their Mauro yet? Interested in minimum dimensions. Looks like my toroid will be 120mm diameter. How much clearance should I leave between the tranny and the pcb, and about what internal height will I need in the case.

(I'm getting the cart before the horse here, and starting on the case before I have the pcb or parts)

Michael

Russ White · 23rd July 2005, 05:20 PM

I am building a simple MDF(you can tell I build a lot of speakers) case Today. It is 12" Deep, 4" tall(inside), and 8" Wide. I am not using a torroid though, I am using a PE 48VCT trafo.

I have already bench tested it, so I know that trafo works great.

I will post pics when I am finished.

Just place the torroid behind the heatsink(fin side) and give it an inch or so a clearance. Get your measurement based on that.

Cheers!
Russ

needlz · 23rd July 2005, 05:33 PM

Would I really need to use a headsink that big or can I use a 1"x1"x5" piece of solid copper?

Russ White · 23rd July 2005, 05:36 PM

I would try it and see how hot it gets.

It will probably be OK, but I have not run the numbers.

DcibeL · 23rd July 2005, 05:40 PM

I will be building Mauro's amp and Russ's FreeBird preamp inside an aluminum case I bought off ebay. The case measures 17"x13"x4" so there will be plenty of room for everything.

23rd July 2005, 05:20 PM	#157
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	I am building a simple MDF(you can tell I build a lot of speakers) case Today. It is 12" Deep, 4" tall(inside), and 8" Wide. I am not using a torroid though, I am using a PE 48VCT trafo. I have already bench tested it, so I know that trafo works great. I will post pics when I am finished. Just place the torroid behind the heatsink(fin side) and give it an inch or so a clearance. Get your measurement based on that. Cheers! Russ __________________ Less pulp more juice Twisted Pear Audio.

23rd July 2005, 05:36 PM	#159
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	I would try it and see how hot it gets. It will probably be OK, but I have not run the numbers. __________________ Less pulp more juice Twisted Pear Audio.

23rd July 2005, 05:40 PM	#160
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	I will be building Mauro's amp and Russ's FreeBird preamp inside an aluminum case I bought off ebay. The case measures 17"x13"x4" so there will be plenty of room for everything. __________________ The power of Science compels you!

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23rd July 2005, 05:08 PM	#156
maf_au diyAudio Member Join Date: Jun 2005 Location: Adelaide	Hi. Has anyone built a case for their Mauro yet? Interested in minimum dimensions. Looks like my toroid will be 120mm diameter. How much clearance should I leave between the tranny and the pcb, and about what internal height will I need in the case. (I'm getting the cart before the horse here, and starting on the case before I have the pcb or parts) Michael

23rd July 2005, 05:33 PM	#158
needlz diyAudio Member Join Date: Nov 2004 Location: Bay Area, CA	Would I really need to use a headsink that big or can I use a 1"x1"x5" piece of solid copper?