LM3875 instead of LM3886?

CorySCline · 16th September 2011, 12:58 AM

Hello all!

I have received my LM3886 Mono order from Brian today! However, I received a LM3875 IC instead. I understand that the main difference is 5 vs 8 pin with mute as option. I take it this will not work?

I have sent a message to Brian at chipamp.com but have not received a reply

Thanks!

Michael Chua · 16th September 2011, 02:55 AM

The LM3875 is not a direct plug-in for a LM3886. All the pins are different. Please see pins assignment below.

CorySCline · 16th September 2011, 03:01 AM

Well that is a bummer.

I did not notice until the kit was finished. I hate desoldering

Michael Chua · 16th September 2011, 04:44 AM

It's not too bad. Use a solder pump first to get most of the solder out. Follow that with solder wick. If it's done right, all the solder will be removed and you can simply lift the LM3875.

If you don't have these tools, cut the legs off. Apply your iron and the remaining leg will drop out. In fact, if you have no use for the LM3875, this is a better method. Easier, faster and lesser chance of damage to your pcb.

CorySCline · 16th September 2011, 04:56 AM

Its not the inability that matters, I just don't like doing it...lol I just hope he will send me the right chip.

CorySCline · 19th September 2011, 10:57 PM

OK, so I called chipamp.com and their "Warehouse Manager" provided the most awesome customer service ever! He told me to keep the 3875 and shipped me a 3886 no questions asked. I received that today (Monday). I made the call Friday at 8 PM. Atlanta to Kansas City. WOW. However, as even more of a "Wow Factor", I looked in the package and he had ALSO shipped me (free of charge) an LM3875 Rev3 PCB to use for the chip I kept. However, I do not have any info on the board requirements for resistors and caps. Anyone have paperwork available for this? I'm assuming it's not the same as what the datasheet calls for...and the website does not even list a 3875 kit as an option lol.

Thanks

lnh · 04:02 PM

That's some amazing customer service...was looking for some pcb's lol, now I think I know where I'll buy them from. You can send the 3875 board and chip to me

CorySCline · 20th September 2011, 04:56 PM

If you want. Just pay shipping.

CorySCline · 20th September 2011, 07:39 PM

Quality stuff though...

lnh · 20th September 2011, 08:05 PM

That looks nice! You've got a pm coming.

What's their phone number...it's not on the site and these boards aren't listed.

16th September 2011, 12:58 AM	#1
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	LM3875 instead of LM3886? Hello all! I have received my LM3886 Mono order from Brian today! However, I received a LM3875 IC instead. I understand that the main difference is 5 vs 8 pin with mute as option. I take it this will not work? I have sent a message to Brian at chipamp.com but have not received a reply Thanks!

16th September 2011, 04:44 AM	#4
Michael Chua diyAudio Member Join Date: Jul 2006 Location: Calais, ME	It's not too bad. Use a solder pump first to get most of the solder out. Follow that with solder wick. If it's done right, all the solder will be removed and you can simply lift the LM3875. If you don't have these tools, cut the legs off. Apply your iron and the remaining leg will drop out. In fact, if you have no use for the LM3875, this is a better method. Easier, faster and lesser chance of damage to your pcb. __________________ AmpsLab.com

20th September 2011, 03:34 PM	#7
lnh diyAudio Member Join Date: Aug 2011 Location: Gilbert, AZ	That's some amazing customer service...was looking for some pcb's lol, now I think I know where I'll buy them from. You can send the 3875 board and chip to me Last edited by lnh; 20th September 2011 at 04:02 PM.

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16th September 2011, 03:01 AM	#3
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	Well that is a bummer. I did not notice until the kit was finished. I hate desoldering

16th September 2011, 04:56 AM	#5
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	Its not the inability that matters, I just don't like doing it...lol I just hope he will send me the right chip.

19th September 2011, 10:57 PM	#6
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	OK, so I called chipamp.com and their "Warehouse Manager" provided the most awesome customer service ever! He told me to keep the 3875 and shipped me a 3886 no questions asked. I received that today (Monday). I made the call Friday at 8 PM. Atlanta to Kansas City. WOW. However, as even more of a "Wow Factor", I looked in the package and he had ALSO shipped me (free of charge) an LM3875 Rev3 PCB to use for the chip I kept. However, I do not have any info on the board requirements for resistors and caps. Anyone have paperwork available for this? I'm assuming it's not the same as what the datasheet calls for...and the website does not even list a 3875 kit as an option lol. Thanks

20th September 2011, 04:56 PM	#8
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	If you want. Just pay shipping.

20th September 2011, 07:39 PM	#9
CorySCline diyAudio Member Join Date: Sep 2011 Location: Kansas City, MO	Quality stuff though...

20th September 2011, 08:05 PM	#10
lnh diyAudio Member Join Date: Aug 2011 Location: Gilbert, AZ	That looks nice! You've got a pm coming. What's their phone number...it's not on the site and these boards aren't listed.

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