My 3886 Chip Amp PCB Layout

lgreen · 28th December 2003, 06:38 PM

Below are pictures of my PCB layout for a stereo amp based on the 3886 chip (inverting configuration like Peter Daniel's and others). I'm just posting this to get comments from everyone prior to actually making the board. Do you think it will work? Obviously the values are not in there, but assume I use the standard values posted by I think Thor and Peter Daniel. This is done on Eagle.

The point of this PCB is to get something that works so I can play around with it a little and get familiar with chip amps. I don't have a rectifier board, this connects after the rectifiers.

1. In particular, are the pins of the 3886 chip connected correctly? I think that they are, and hope that I got the orientation correct. If you can verify this that would be great.
2. I have made this for a pcb mounted attenuator, but left connection points for external attenuators, so that is why you see extra points for "wiper" and such.
3. Also made a provision for a larger coupling capacitor, so you see an extra hole for that too.

Comments appreciated, and yes, this is my first ever PCB design.

lgreen · 28th December 2003, 06:47 PM

Here is the overall layout.

On right side I think pin 1 is on top, and pin 11 on bottom, on left side I think pin 11 on top and pin 1 on bottom.

lgreen · 28th December 2003, 06:52 PM

Here are the layers and pads for a better view. Red is top layer, blue is bottom layer, the thick traces are .07 inches (1.778 mm).

peranders · 28th December 2003, 08:19 PM

I think you should identify all high current traces and make them wider. The LM3886 can handle at least 11.5 A.

lgreen · 29th December 2003, 01:01 AM

How wide should they be?

SkinnyBoy · 29th December 2003, 01:04 AM

probbaly 3 times as wide as they are now...

28th December 2003, 06:38 PM	#1
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	My 3886 Chip Amp PCB Layout Below are pictures of my PCB layout for a stereo amp based on the 3886 chip (inverting configuration like Peter Daniel's and others). I'm just posting this to get comments from everyone prior to actually making the board. Do you think it will work? Obviously the values are not in there, but assume I use the standard values posted by I think Thor and Peter Daniel. This is done on Eagle. The point of this PCB is to get something that works so I can play around with it a little and get familiar with chip amps. I don't have a rectifier board, this connects after the rectifiers. 1. In particular, are the pins of the 3886 chip connected correctly? I think that they are, and hope that I got the orientation correct. If you can verify this that would be great. 2. I have made this for a pcb mounted attenuator, but left connection points for external attenuators, so that is why you see extra points for "wiper" and such. 3. Also made a provision for a larger coupling capacitor, so you see an extra hole for that too. Comments appreciated, and yes, this is my first ever PCB design.

28th December 2003, 08:19 PM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I think you should identify all high current traces and make them wider. The LM3886 can handle at least 11.5 A. __________________ /Per-Anders (my first name) or P-A as my friends call me

29th December 2003, 01:01 AM	#5
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	How wide? How wide should they be?

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29th December 2003, 01:04 AM	#6
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	probbaly 3 times as wide as they are now...

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