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Old 13th December 2003, 12:14 AM   #1
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Default PCBs for stereo bridged 3886

I was wondering if somebody has designed a stereo 220W amplifier using 4 lm3886s and made pcbs for it. If so, could somebody please post the pcb layout.

Thank you for your help, Mike
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Old 13th December 2003, 12:23 AM   #2
cm961 is offline cm961  Canada
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I designed a PCB for a bridged/paraelle amp but its mono. However, I only have one set of bypassing capacitors. They're located in the middle between the 4 chips. Does anyone know if this is good enough, or should each lm3886 have its own bypassing caps, and if so how big?

Pete
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Old 13th December 2003, 12:27 AM   #3
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Would you mind posting it if you have it Peter?
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Old 14th December 2003, 01:48 AM   #4
cm961 is offline cm961  Canada
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Sure no problem.

Included in the zip file are four files. One shows the entire board, all components and tracks. One shows the top layer tracks. One shows the bottom layer tracks. And then I've included the schematic as well.

Cautions.... This is untested. I do plan on building it, but not during exams! Ok, now it only has one set of bypassing capacitors for the four op amps. I have no idea whether this is a bad thing or not. Perhaps with a regulated supply it would be ok, or maybe it's fine anyway. I've tested the circuit in circuitmaker and it seems to work fine there. It's pretty well straight from the application note. If you build it please let me know how it goes so I can make any changes before I build it! hehe.

Ok the file is too big to attach, so I'll go image by image.

Enjoy.

Pete
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File Type: jpg bpa200all.jpg (48.7 KB, 850 views)
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Old 14th December 2003, 01:52 AM   #5
cm961 is offline cm961  Canada
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And here's the bottom layer...

Pete
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File Type: jpg bpa200bottom.jpg (37.6 KB, 811 views)
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Old 14th December 2003, 01:54 AM   #6
cm961 is offline cm961  Canada
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The top layer....
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File Type: jpg bpa200tracks.jpg (34.7 KB, 792 views)
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Old 14th December 2003, 01:57 AM   #7
cm961 is offline cm961  Canada
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And the schematic. Note that I scaled these by 50% so that I could post them. I can give you the circuitmaker files if you want them. You can get circuitmaker from ***** or their website.

Pete
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File Type: jpg bpa200schematic.jpg (23.0 KB, 3519 views)
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Old 14th December 2003, 06:54 AM   #8
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soundNERD, have you missed Thomas Madsen's PCB?
200 watts Gäjnklon (Gainclone) - BPA200

My looks like this
http://home8.swipnet.se/~w-80046/hif...0schema_p1.pdf
http://home8.swipnet.se/~w-80046/hif...0layout_cp.pdf
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Old 14th December 2003, 01:01 PM   #9
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Thanks for all of the responces.

This project has been put off for now, since two people have asked me to build them a headphone amplfiier like the one i built using the lm4881 chip and i am working on my 300W subwoofer using the B/P LM3886's. I figured i would ask now so when I get to it i would have the pcb.

Just wondering, has anybody done what I want to do, using 2 x 2 lm3886 in bridged mode?If so, has anybody designed a pcb just for that?

Thanks for your help, though, Mike
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Old 14th December 2003, 01:35 PM   #10
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Quote:
Originally posted by soundNERD
Just wondering, has anybody done what I want to do, using 2 x 2 lm3886 in bridged mode?If so, has anybody designed a pcb just for that?
.... you don't seem to have checked Thomas Madsen's pcb...?
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