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Old 16th August 2005, 05:41 AM   #1
Jean is offline Jean  United States
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Default 6 Channel LM3886

Hello,

Here is my current progress with a 6 channel lm3886 based amplifier. I am thinking about mounting all 6 LM's down the center to a thick copper or aluminum bar. I will most likely use a two tier method, mounting a single transformer under the boards.

Suggestions ?


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Old 16th August 2005, 06:26 AM   #2
karma is offline karma  Canada
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copper would be nice
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Old 16th August 2005, 09:01 PM   #3
G4ME is offline G4ME  United States
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what size toroid are you looking at?

personally i would put them on the sides, as that gets more air convection, but if you go big enough on the center bar i am sure you will be fine.
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Old 18th August 2005, 04:20 PM   #4
Leolabs is offline Leolabs  Malaysia
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Try to look inside of a MBL or Plinius intergrated amplifier.
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Old 19th August 2005, 07:37 AM   #5
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Old 20th August 2005, 05:54 AM   #6
renfrow is offline renfrow  United States
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You might also consider a heat sink like this one found at http://www.apexjr.com/new.htm, just over halfway down the page. It's predrilled for a boatload of TO-3's, but, you could drill your own holes...

Tom.
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Old 14th May 2013, 07:08 PM   #7
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Default 6/8 channel LM3886 amp, with SMPS?

Im in need for a multichannel amp, 6 to 8 channels. I have decided to use the LM3886 chip, but still open for other ideas, as nothing have been purchased or written in stone yet. Im borrowing this old post from 2005.

Im thinking of ordering the chipamp.com pcb's, and use a SMPS to deliver the power.


Is it possible to use this SMPS from connex to power up 6 LM3886 channels in the same enclosure.

SMPS800RE
+-32V

Will there be any problems with hum, noise or other ground-related issues, and would the PS be able to deliver enough "juice"?


Am I right in assuming +-32V is a bit high for 4 ohm load?

Can another solution be to make 2 separate 4-channel amplifiers with this SMPS:
SMPS500R
+-24V

The same questions regarding hum and power does apply here too.
This is my first post on this forum, and i dont have alot of experience with electronics.
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Old 15th May 2013, 05:35 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by zaibz View Post
...........Am I right in assuming +-32V is a bit high for 4 ohm load?.........
You are right, but it is manageable if you take care to ensure your 4ohms speakers are of moderate reactance and you have normal domestic listening, where P average ~-20dB ref maximum output and you keep the chips cool.

NS have a graph showing the typical Heatsink required for operating temperatures at 150C.
I always suggest you double the size of the sink for our typical use.

If for +-32Vdc (=64Vdc) and 4ohms with ambient temperature at the heatsink = 25C, NS show 2C/W, then use 1C/W for each channel.
6 channels would require an enormous heatsink with a rating of 0.17C/W
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