LM3886*3 Amp ebay kit - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th November 2010, 09:32 PM   #1
FOXYE is online now FOXYE  Israel
diyAudio Member
 
Join Date: Feb 2009
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?
  Reply With Quote
Old 9th November 2010, 10:20 PM   #2
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 102
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
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.
__________________
No matter if we meanwhile surrender every value for which we stand, we must strive to cajole the majority into imagining itself on our side - Everett Dean Martin
  Reply With Quote
Old 10th November 2010, 04:29 AM   #3
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
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
  Reply With Quote
Old 11th November 2010, 03:31 AM   #4
FOXYE is online now FOXYE  Israel
diyAudio Member
 
Join Date: Feb 2009
Here the schematic

http://img574.imageshack.us/img574/3301/111el.jpg

Last edited by FOXYE; 11th November 2010 at 03:46 AM.
  Reply With Quote
Old 11th November 2010, 05:57 AM   #5
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
On your schematic I was talking about:

R1 , r4 , r10 and r3 , r6, r12

i was also talking about

c4 , c6 , c11
  Reply With Quote
Old 13th November 2010, 02:14 PM   #6
frank1 is offline frank1  United Kingdom
diyAudio Member
 
Join Date: Apr 2006
Location: Devon UK
Angry Ebay seller

Quote:
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
Frank
  Reply With Quote
Old 13th August 2014, 09:49 AM   #7
jlithen is offline jlithen  Finland
diyAudio Member
 
Join Date: Nov 2009
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
  Reply With Quote
Old 13th August 2014, 03:47 PM   #8
Bare is offline Bare  Canada
diyAudio Member
 
Join Date: Dec 2001
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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
NAP-140 Clone Amp Kit on Ebay DreadPirate Solid State 1226 Today 12:27 PM
Ebay 2SC5200/A1943 amp kit riktw Solid State 7 13th July 2010 05:24 AM
Ebay, DIY 800watt Amp kit? longblock454 Solid State 9 1st September 2008 11:58 AM


New To Site? Need Help?

All times are GMT. The time now is 12:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2