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tla-Audio 29th September 2005 06:44 AM

Single sided non inverting LM3886 PCB
2 Attachment(s)
Hi everyone

Another LM3886 GC proyect.

The PCB is in PDF format, 1:1 scale and is oriented to the monoblock concept.
Provisions are made for dual rectifier snubberized power supply with dual size electrolitic filter capacitors footprint and polyester bypass capacitors.
Power on led acts as discharging path for the supply capacitors, when the amp is switched off.
Flexibility of the board allows 2 parallel input capacitors, ultrasonic input filter, poly capacitor between + & - pins, single bipolar or 2 opposite series Ci capacitors, switched or jumped mute circuit, Cf feedback capacitor, output Zobel network and series resistor or inductance (10 turns of 0.4mm enamelled copper wire, wound around the body of the 10 Ohm/ 2 W metalic film resistor).
The schematic will be posted soon.


PierreG 5th October 2005 12:55 PM

Thanks. I like single sided boards. Easier to make at home.;)
Yes I would like to see the schematic and the components name on the silk screen.

tla-Audio 5th October 2005 06:31 PM

Single sided non inverting LM3886 PCB
2 Attachment(s)
Hello PierreG

Here it's the silk screen, with the parts reference.

Next post will include the schematic.

M. Font

tla-Audio 5th October 2005 08:58 PM

Single sided non inverting LM3886 PCB
2 Attachment(s)
These are the schematics.

You may notice strange layout, like caps in paralel, etc. This is due to the difficulty to obtain some parts at my country.

Hope my work would be useful to your projects.
Let me know if you have improvements to do.

This post has the schematic of the amplifier section.

M. Font

tla-Audio 5th October 2005 08:58 PM

Single sided non inverting LM3886 PCB
2 Attachment(s)
This is the PSU schematic

M. Font

zafira1981 15th November 2005 07:20 PM

hi!!! this is exactly what I was looking for. schematic & pcb for a lm3886 project. thanks a lot!!!!

pd: somos vecinos, soy de Argentina ;) tenés MSN?

ArtiomR 4th December 2005 07:44 PM

Thanks a lot for your PCB tla-Audio Recently I was in search for a good PCB for LM3886, and yours looks nice and with fat simmetrical ground :)

But I think, there is one mistake in your schematic and PCB - R2 resistor should be connected between Cin and R1, so that they form a high pass filter ;)

It would be very nice if you corrected this little issue and posted a new PCB file. Of course, I could do it for myself(in Paint :cannotbe: ), but pdf is much better(scaling without squared edges)


Pramod Kumar 29th July 2007 05:15 PM

Hello ArtiomR,

Did you make the LM3886 PCB? Do you have a corrected version of the PCB layout posted by tla-Audio? If so, could you please upload it?. Thanks very much.

Pramod Kumar

tubob 2nd August 2007 08:16 AM


do you intend to sell the pcb ?...
or just want to share the work? is good


ArtiomR 3rd August 2007 04:54 PM

Somehow I didn't make an amp with Miguel's PCB :xeye: Probably cause at that time I already made one with another PCB. The result didn't impress me :o Maybe I got fake LM3886s (one chip was not functional and after breaking it I saw a die glued slantwise!), or it was the PCB... anyway I lost interest in these chips. (I had better luck with TDA7294)

Anyway you may try Miguel's PCB - it looks nice :)


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