lm3886 circuit and pcb

Guy_81 · 17th July 2005, 06:23 PM

Hi,

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

I'am stil working/ thinking on de PSU circuit

mateo88 · 17th July 2005, 06:29 PM

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.

digi01 · 18th July 2005, 07:30 AM

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.

Guy_81 · 18th July 2005, 08:59 AM

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.

SpittinLLama · 22nd July 2005, 11:51 PM

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

17th July 2005, 06:23 PM	#1
Guy_81 diyAudio Member Join Date: Nov 2004 Location: -	lm3886 circuit and pcb Hi, I'am going to build a lm3886 based amp. What do you think about this circuit and pcd layout? I'am stil working/ thinking on de PSU circuit

18th July 2005, 07:30 AM	#3
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	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. __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

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17th July 2005, 06:29 PM	#2
mateo88 diyAudio Member Join Date: May 2004 Location: Argyle, Texas	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.

18th July 2005, 08:59 AM	#4
Guy_81 diyAudio Member Join Date: Nov 2004 Location: -	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.

22nd July 2005, 11:51 PM	#5
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	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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