My Version of Mauro Penasa's LM3886

Stanley Drake · 27th December 2006, 06:02 PM

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.

moamps · 27th December 2006, 06:06 PM

Stanley, was there supposed to be an attachment here to review?

Stanley Drake · 27th December 2006, 06:30 PM

I have some problems, how to download picture to forum?

moamps · 27th December 2006, 06:33 PM

Here you go. And what a nice picture it is.

Regards,
Milan

Stanley Drake · 27th December 2006, 06:37 PM

and schematics:

Stanley Drake · 28th December 2006, 10:04 AM

I have rerouted a bit and:
- Do I need to use star routed groud?
- Does my current ground looks ok?

Nordic · 28th December 2006, 10:19 AM

incomplete schematic and pcb.... the schematic is a 2 page jobby, you are missing DC protection components and relay.

Stanley Drake · 28th December 2006, 11:55 AM

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?

AndrewT · 28th December 2006, 02:55 PM

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?

Stanley Drake · 28th December 2006, 03:40 PM

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.

27th December 2006, 06:02 PM	#1
Stanley Drake diyAudio Member Join Date: Oct 2006	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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27th December 2006, 06:06 PM	#2
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	Stanley, was there supposed to be an attachment here to review?

27th December 2006, 06:33 PM	#4
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	Here you go. And what a nice picture it is. Regards, Milan

28th December 2006, 10:19 AM	#7
Nordic diyAudio Member Join Date: Sep 2005	incomplete schematic and pcb.... the schematic is a 2 page jobby, you are missing DC protection components and relay.

28th December 2006, 11:55 AM	#8
Stanley Drake diyAudio Member Join Date: Oct 2006	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?

28th December 2006, 02:55 PM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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?