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Old 29th December 2014, 01:11 AM   #1
djduck is offline djduck  Estonia
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Default Cheapo fleabay gainclone kits?

So I need an amplifier for a friend. He's currently using a TDA something based 3 channel amplifier I built that runs off of an ATX PSU's 12V rail. Sounds alright but could do better. So I thought I'd make a late christmas/new years present- a less crappy amplifier!
I'd like to go with a gainclone. Cost matters here, I'm a poor man. Also because they're simple, an I need to get the build done quick.
I've got most of the parts- the case, connectors, multiple transformers to choose from, etc...
Basically, all I need is amp modules now. I'd like to go with an LM3886 or something along the lines, but since bad designs can oscillate and cause all kinds of havoc, I want to check here first to make sure I'm not paying for crap.
Basically, I want an ebay kit because my budget is only around $30 or so.
Here is a list of options, I'd like to know whether any of these are worth giving a shot
1 PC 2 68W Watt LM3886 NE5532 Audio Amplifier Board | eBay
LM3886 NE5532 DC Servo Mounted 2X68W Current Dynamic Feedback Amplifier Board | eBay
2 x Super NS LM3886 LM3886TF Audio Power Amplifier Kit | eBay
2X60W Power Amp LM4780 Fully Built Unit | eBay
Upgrated LM3886 LME49720 Amplifier DIY Kit Speaker Protection 68W Gain Switch | eBay
Audio Power Amplifier LM3886TF Amp Board Kit Rectifier Filter Power DIY Kit | eBay
New MX50 SE 100W 100W 100WX2 Power Amp Kit Stero Amplifier Kit DIY Free | eBay
2pcs 30W Class A High Current Amplifier FET Amp Board Kit | eBay

Last two are solid state designs, which are also options. I'd like to try the class A modules especially.
Since there are more options, feel free to share yours Just remember my budget

Cheers!
-Joel
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Old 29th December 2014, 09:36 AM   #2
Mihkus is offline Mihkus  Estonia
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Pretty much everything on ebay is junk...
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Old 29th December 2014, 09:47 AM   #3
djduck is offline djduck  Estonia
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Quote:
Originally Posted by Mihkus View Post
Pretty much everything on ebay is junk...
I know, thanks for the generic answer, bro
I know that some of the kits work and people have build them and used them without their amp or speakers going seppuku.
Out of all the kits, I really like this one: Upgrated LM3886 LME49720 Amplifier DIY Kit Speaker Protection 68W Gain Switch | eBay
Power supply right on the boards, op-amp buffered, speaker protection, you name it. Just needs a transformer and case.
And I really like the class A kit as well, but the circuit seems too simple to be good, I guess...
Found some huge TO-3 hetasinks, so the JLH 1969 is also an option: http://www.ebay.com/itm/1-Pair-Of-JL...item3ce6ae24c3

Last edited by djduck; 29th December 2014 at 10:05 AM.
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Old 29th December 2014, 11:16 AM   #4
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People seem pretty happy with the Chinese tpa 3116 boards. Not everything from our Eastern friends is crap. At any rate, enjoy your project.
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Old 29th December 2014, 12:03 PM   #5
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I have just built the JLH kit you show.
Its a great quality kit and good pcb. Most of the smaller caps are rubycons ,changed the others with good second hand ones I had in stock. The transistors all seem genuine ST and can easily be replaced at a latter stage with mj15003.

I like mine and am just waiting to add speaker protection as it has slight thump on and off
The is a sticky post in forum too about jlh and all mods etc
happy building
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Old 29th December 2014, 12:29 PM   #6
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check these forums for tda729x point to point.
danielwritesback has power level OVER 9000 (see here https://www.youtube.com/watch?v=SiMHTK15Pik)
when building those things, and it would be a very cheap option.

powersupply will be what you are going to pay for a lot of money.
unless you have the guts and crazy enough to build the russian Xformerless psu.
not going to give a link for that, as it is potentialy lethal.
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Old 29th December 2014, 12:40 PM   #7
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I have built several of the LM3886 cheapo boards for various projects and all have worked well. you won't win stereophiles product of the year with one but if you just need a garage/basement/bedroom amp they worked well enough. my only complaint is that they all use the easy to implement isolated tab version of the 3886 which handles less power.

I most recently built this one
www.ebay.com/itm321448788930

took about 2 weeks to get here. but add a transformer and some jacks and go!

Zc
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Old 29th December 2014, 02:08 PM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Mihkus View Post
Pretty much everything on ebay is junk...
Wrong.

Some might be junk.
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Old 29th December 2014, 07:01 PM   #9
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Quote:
Originally Posted by djduck View Post
I know, thanks for the generic answer, bro
I know that some of the kits work and people have build them and used them without their amp or speakers going seppuku.
Out of all the kits, I really like this one: Upgrated LM3886 LME49720 Amplifier DIY Kit Speaker Protection 68W Gain Switch | eBay
Power supply right on the boards, op-amp buffered, speaker protection, you name it. Just needs a transformer and case.
...[/url]

The price is right! (as it usually is) but note that doesn't include the big ps caps and the cool purple ones:

3 PLS note: The Kit and assembled board does not contain 2pcs Nichicon (10000uF) capasitors
For chemical 10000UF-50V capasitors*2-----need ADD 6USD.
For ELNA-AUDIO capasitors*2----------need ADD 14USD.


I don't like that there's no powersupply caps by the second 3886.

3886 pcb top.JPG

3886 pcb bot.JPG
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Old 29th December 2014, 07:07 PM   #10
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Quote:
Originally Posted by Zero Cool View Post
...

I most recently built this one
www.ebay.com/itm321448788930

took about 2 weeks to get here. but add a transformer and some jacks and go!

Zc

Same thing here, no ps caps beside the 3886s:

LM3886TF-MS-01.jpg

60W LM3886TF Sound Audio Amplifier 2 Channel Digital Power Amp | eBay

or item 321448788930
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