Ebay kits

littlerick · 2012-09-08 5:11 pm

Ive been looking at the 3886 kits on ebay, as far as price goes they are pretty cheap.

Anybody got any good or bad feedback on any kits available. I prefer to get it and build as per instructions, not yet good enough to start changing stuff.

Anyway what i want to build is a 4 channel 3886 with 2 used as speaker output and 2 bridged to power a sub. planning on dual mono for output speakers plus single transformer for sub. 3 transformers, 2 x kits.

At around £30 and free post it seems a good price.

bcmbob · 2012-09-09 11:28 am

Your question is too broad. There are thousands of builders who have successfully implemented a wide variety of kits. If there is something on eBay that you like and can link to, that would provide a starting point to answer your question.

littlerick · 2012-09-09 12:06 pm

I was just looking to see if anyone had got products that were either a complete waste or if there was actualy some good kits.

I got a 4780 kit from audiosector and the amp is a great piece of kit, i want to do another, but my budget is tight so i am looking at the cheaper kits. If I had the extra cash I would certainly use audiosector or chipamp, but if a lot of people have had dodgy stuff off ebay, maybe the price is not so tempting.

Just getting feedback before i commit.

donpetru · 2012-09-09 12:15 pm

I think that is a fair price (approximately 16 USD with free shipping):
LM3886TF Amplifier Board DIY LM3886 Components KIT Single-channel Brand NEW | eBay

frank1 · 2012-09-09 12:46 pm

I bought 16 chip-amp PCB's from a Hong Kong seller for a project.
All failed to work.
One plated-through hole wasn't through-plated so easily fixed.
I tried to inform the seller but I just couldn't get him to understand. The only reply he gave me was he'd sold thousands......
Successful outcome though.
Frank

Arty · 2012-09-09 11:08 pm

comes into question why would lm 3886 need a pcb at all..
http://www.diyaudio.com/forums/chip-amps/187527-point-point-lm3886.html

save the pcb hassle for projects complicated enough.
//if there is any..//

littlerick · 2012-09-10 12:03 am

I looked at the P2P but i dont think im good enough to take it on yet.

bcmbob · 2012-09-10 10:28 am

Rich, Don'tknow if you have seen it, but there is a lot of information on the kit in post # 4. Could be helpful to a new builder. http://www.diyaudio.com/forums/chip-amps/207971-bought-xy-lm3886-kit.html#post2930771

CharlieLaub · 2012-09-10 4:26 pm

Next time, try to use the "Search" feature of the forum before asking a question that has been asked 10's of times before...

For instance, here is a thread that I posted in:
http://www.diyaudio.com/forums/chip-amps/196123-lm3886-pcb.html

I have purchased over 20 LM3886 chip amp boards via Ebay and all have worked 100%. Check my post #21 to see which I am referring to. Avoid boards with onboard power supply, protection, etc.etc. Just get the single channel board that is shown in my post and you will be fine.

-Charlie

Headbanger · 2012-09-10 5:27 pm

LM3886 is easy, really easy to p2p, LM4780 was harder to do. And my ears always say p2p sounds better, no idea why. Maybe due to compactness, short tracks.

lbstyling · 2012-09-13 9:52 pm

Surely most/many of the ebay lm3886's are going to be fake though?

-while im on this, can you bias this chip further into class A?

bcmbob · 2012-09-13 10:00 pm

Please don't paint all eBay vendors with the same brush. I have done business with three or four who not only insure their parts are genuine but are more than willing to provide extended free customer support. I can PM some references if the need exists.

moriendi · 2012-09-18 1:20 am

Assembled TDA7294 2.1 channel Power amp board with speaker protection -Upgraded | eBay

I'm looking for decent 2.1 board... Any experiences with this one? What about seller and his writings that TDA7294's are genuine? I can hardly believe that any 7294 board on ebay is legit.

Thanks.

Bare · 2012-09-18 2:38 am

Wow! lookit all those Wongs Noodle / Aerospace Research Company's PS capacitors.
Must be at least $3 worth fitted on there.
How can you doubt the quality ?? Nothing but Cynics on here

redjr · 2012-09-18 9:39 pm

bcmbob said:
Please don't paint all eBay vendors with the same brush. I have done business with three or four who not only insure their parts are genuine but are more than willing to provide extended free customer support. I can PM some references if the need exists.

I agree. I think it is very unfair to paint all ebay (perhaps more to the unspoken point is 'China') vendors with that brush. I too have dealt with 2-3 vendors and spent hundreds of dollars, and never have received a faulty product yet. I consistently deal with a favorite seller, who answers all my questions and even provides tech support on occasion. He offers a broad selection of kits, modules, assembled products and misc parts. Sure the shipping seems high, but I don't blame the seller for that. I often place multiple item orders and request he ship via 'express'. He does and often gives me a refund. I often request special orders and/or spare parts and he always quotes me a fair price. My only wish is that he was down the street instead of halfway around the world!

Rick

moriendi · 2012-09-18 9:42 pm

That's all nice... But can somebody tell me is that kit, which I have linked above, considerable for decent 2.1 setp? At least from design point of view.

redjr · 2012-09-18 9:49 pm

moriendi said:
Assembled TDA7294 2.1 channel Power amp board with speaker protection -Upgraded | eBay

I'm looking for decent 2.1 board... Any experiences with this one? What about seller and his writings that TDA7294's are genuine? I can hardly believe that any 7294 board on ebay is legit.

Thanks.

I can't vouch for that particular product, but along generally serves up quality items. I have bought many of his products - and depending upon what it is, is generally of superior quality. That particular product looks like it would provide the guts to a nice, modest integrated amp - at a fair price.

Rick

moriendi · 2012-09-18 9:54 pm

Thanks mate, that's an answer I was hoping to hear. I took a look into his shop, some fine products there.

routhun · 2012-09-20 3:59 am

I second Rick, I bought several kits from Along. He provides quality stuff for the price. He responds very quickly to our questions.

I bought several items from these sellers never received a bad product.

abraxalito · 2012-09-20 4:58 am

moriendi said:
What about seller and his writings that TDA7294's are genuine? I can hardly believe that any 7294 board on ebay is legit.

About a fortnight ago I bought a batch of TDA7293 at my local e-market. They turned out to be fakes - they're re-marked TDA7294s. Evidence for that was easy to find - pin5 is internally not connected. I took them back and tried another vendor with the same result. I don't think either guy had any idea they were fakes. My third attempt at getting TDA7293 is buying them second hand on Taobao - waiting for delivery now. I can't figure out what lesser part could be persuaded to pose as a faked up TDA7294 though - anyone with any ideas?

I suggest anyone wanting real TDA7293s buys them on a known working paralleled board, not as separate parts unless you can persuade the seller to test pin5 first.

Ebay kits

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