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Old 28th December 2003, 05:38 PM   #1
lgreen is offline lgreen  United States
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Default 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.
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Old 28th December 2003, 05:47 PM   #2
lgreen is offline lgreen  United States
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Default Overall Layout

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.
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Old 28th December 2003, 05:52 PM   #3
lgreen is offline lgreen  United States
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Default Layers and Pads

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).
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Old 28th December 2003, 07:19 PM   #4
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I think you should identify all high current traces and make them wider. The LM3886 can handle at least 11.5 A.
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Old 29th December 2003, 12:01 AM   #5
lgreen is offline lgreen  United States
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Default How wide?

How wide should they be?
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Old 29th December 2003, 12:04 AM   #6
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probbaly 3 times as wide as they are now...
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