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Stanley Drake 27th December 2006 06:02 PM

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.

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

2 Attachment(s)
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.;)


Stanley Drake 27th December 2006 06:37 PM

2 Attachment(s)
and schematics:

Stanley Drake 28th December 2006 10:04 AM

2 Attachment(s)
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

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

2 Attachment(s)
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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