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Old 27th December 2006, 06:02 PM   #1
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Default My Version of Mauro Penasa's LM3886

I have redrawed and routed Maura's version of LM3886 chipamp. It's my first project in Protel.
Could someone check is there some errors like bad routed ground etc.
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Old 27th December 2006, 06:06 PM   #2
moamps is offline moamps  Croatia
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Stanley, was there supposed to be an attachment here to review?
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Old 27th December 2006, 06:30 PM   #3
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I have some problems, how to download picture to forum?
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File Type: png lm3886 pcb.png (72.5 KB, 1019 views)
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Old 27th December 2006, 06:33 PM   #4
moamps is offline moamps  Croatia
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Here you go. And what a nice picture it is.

Regards,
Milan
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Old 27th December 2006, 06:37 PM   #5
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and schematics:
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File Type: png lm3886 schematic.png (37.9 KB, 1017 views)
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Old 28th December 2006, 10:04 AM   #6
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I have rerouted a bit and:
- Do I need to use star routed groud?
- Does my current ground looks ok?
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File Type: png lm3886 pcb.png (68.5 KB, 788 views)
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Old 28th December 2006, 10:19 AM   #7
Nordic is offline Nordic  South Africa
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incomplete schematic and pcb.... the schematic is a 2 page jobby, you are missing DC protection components and relay.
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Old 28th December 2006, 11:55 AM   #8
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I have another DC protection circuit on separate PCB and it's already done and I no need to make Mauro's DC protection.
What about amplifier PCB does there everything routed right?
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Old 28th December 2006, 02:55 PM   #9
AndrewT is online now AndrewT  Scotland
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Hi,
is the 3886 allowed to run at low gain?

You seem to have 47k (R7) into 22k (R14) giving -7db.

Does R10+C7 compensate?
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Old 28th December 2006, 03:40 PM   #10
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Well, I have redrawed Mauro's schematics and a lot of peoples use this amplifier and I think that this schematic must be correct.
I have compared every value with Mauro's version and everything the same.
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File Type: pdf mauro penasa rev. c.pdf (29.7 KB, 182 views)
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