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Old 9th November 2010, 09:32 PM   #1
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Default LM3886*3 Amp ebay kit

Anyone know this amp kit?

LM3886*3 Amp + Power supper kit/DIY - eBay (item 320464946907 end time Nov-14-10 23:03:59 PST)

How good is it? And is the amp kit reliable?
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Old 9th November 2010, 10:20 PM   #2
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Since the seller has put up his email address, why not request a schematic of the paralleled amp from him? Things to check are that close tolerance parts are used in the gain networks - there are trimmers on the board but those might be for offset trimming purposes. If the design is based on National's AN-1192 it might have problems. The price looks reasonable given the 1off price of LM3886 is around $7.
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Old 10th November 2010, 04:29 AM   #3
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i have used the bare pcb's from the seller in my build.

the schematic looks like this one:

DIY BPA300 6x LM3886 300W audio Amplifier

i would however not trust the gain and feedback resistors and if you buy the complete kit change them out with decent 0.1% items.

also i felt that C2 capacitor(as per link schematic) was far to big a size and would cut into audio spectrum. You can change these to around 10pF.

Without those 3 capacitors the board immediately oscillated i found in my testing. and made the zobel resistor smoke
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Old 11th November 2010, 03:31 AM   #4
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Here the schematic


Last edited by FOXYE; 11th November 2010 at 03:46 AM.
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Old 11th November 2010, 05:57 AM   #5
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On your schematic I was talking about:

R1 , r4 , r10 and r3 , r6, r12

i was also talking about

c4 , c6 , c11
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Old 13th November 2010, 02:14 PM   #6
frank1 is offline frank1  United Kingdom
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Location: Devon UK
Angry Ebay seller

Originally Posted by FOXYE View Post
Anyone know this amp kit?

LM3886*3 Amp + Power supper kit/DIY - eBay (item 320464946907 end time Nov-14-10 23:03:59 PST)

How good is it? And is the amp kit reliable?
I think this is the seller I had a problem with.

I ordered several LM3886 and power supply PCB's to make 2x 5-channel amps.
None of them worked at first...
There was no through-hole plating on one end of C7 (the input cap).
I tried complaining but couldn't get my message through - Language problem!!!
Gave up in the end and just soldered the lead both sides.
The boards were good quality apart from that. I can't beleive no-one else noticed
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Old 13th August 2014, 09:49 AM   #7
jlithen is offline jlithen  Finland
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Location: Vaasa
If you ask the seller nobody has ever had a problem with anything

I have only purchased two boards like this and assembled them with high quality components.
NOS MKC caps and LM3886 ordered directly from manufacturer.

They have an enormous amount of detail and dynamics for the price (and simplicity).
I am anyway going to sell my amp because they sound too bright for me.
I mostly use amps designed by Mr. Pass

In general Chinese PCBs are good (might have some mistakes like turning pot counter-clockwise increases volume) but their soldering and fake components are crap.
A kit that you assemble yourself lets you replace bad components easily and your soldering is most probably much better than Chinese soldering
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Old 13th August 2014, 03:47 PM   #8
Bare is offline Bare  Canada
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Location: vancouver
Perhaps this :
Akitika Store
US designed/made. Not Chinee cheap though, for reason
It's a Good sounding one, in my experiences.
Buy it built or as components, dependent on your budget
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