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Old 17th July 2005, 06:23 PM   #1
Guy_81 is offline Guy_81  Netherlands
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Default lm3886 circuit and pcb

Hi,

I'am going to build a lm3886 based amp. What do you think about this circuit and pcd layout?

Click the image to open in full size.

I'am stil working/ thinking on de PSU circuit
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Old 17th July 2005, 06:29 PM   #2
mateo88 is offline mateo88  United States
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The PCB looks good, though the trace to pin 5 might need to be a bit bigger. Try making the pads for the NC pins a little bit smaller, and that should free up a little room.

Looks good though!

Edit: is that resistor on the output .1 ohms? I can't tell if it's 1 or .1, and 1 is a little to high, in my opinion. A .22 or .1 ohm resistor would probably be better.
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Old 18th July 2005, 07:30 AM   #3
digi01 is offline digi01  China
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the trace to pin 5 is poor.I think you can use the room of pin 2.NC is no connections,so it is easy to deal.

Z.
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Old 18th July 2005, 08:59 AM   #4
Guy_81 is offline Guy_81  Netherlands
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isn't it so that pin one and 5 are internaly connected. so that if the trace to pin one is big the trace to pin 5 can be smaller.

the resitor in the output is a 10 ohm resistor with a coil soldert parralel on top of it. It supose to help keep the amp from osccilating.
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Old 22nd July 2005, 11:51 PM   #5
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You want as big of traces as possible to all the power pins. Internal bond wires can only handle so much current and this is why there are multiple supply voltage pins. If the trace to pin 5 is very short when small that is OK. It never hurts to have more trace width.

-SL
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