I've seen these boards on both AliExpress, and eBay, and I'm curious if anyone has tried them. If they do what they say they do, they appear to be quite a good deal. It even includes a servo circuit implemented with surface mount parts on the rear of the board.
180W LM3886T x6 parallel/BTL power amplifier w/output DC servo ckt huge PCB ! | eBay
DIYERZONE One Pair Assembeld LM3886 Amp Board Base on JEFF Rowland Amp 360W+360W L11 4-in Amplifier from Consumer Electronics on AliExpress
180W LM3886T x6 parallel/BTL power amplifier w/output DC servo ckt huge PCB ! | eBay
DIYERZONE One Pair Assembeld LM3886 Amp Board Base on JEFF Rowland Amp 360W+360W L11 4-in Amplifier from Consumer Electronics on AliExpress
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You are in dangerous territory...
This is a little bit complicated. First, the design may be OK. It is a well known design and has been used with servo and pot´s to even out the 3886 chips. Second, the 3886 chips are 99.9% fake.
Then be aware that the sound quality largely depends on the power supply and input stage.
If you replace the 3886 (which is quite inexpensive if you buy 15 or more from a "real" distributor) and maybe the servo OP-amps, add a 600 Watt, +-35 Volt supply (good SMPS!), You should be able to get a first class, powerful and reliable amp with 200W/8 Ohm and 400W/4 Ohm.
Have a look at the input circuit, as I suppose it must be driven balanced (or have a balancing stage).
If one chip is fake, why should the others be real?
Anyhow, usually these boards are even a bargain if you replace all parts and use only the PCB.
This is a little bit complicated. First, the design may be OK. It is a well known design and has been used with servo and pot´s to even out the 3886 chips. Second, the 3886 chips are 99.9% fake.
Then be aware that the sound quality largely depends on the power supply and input stage.
If you replace the 3886 (which is quite inexpensive if you buy 15 or more from a "real" distributor) and maybe the servo OP-amps, add a 600 Watt, +-35 Volt supply (good SMPS!), You should be able to get a first class, powerful and reliable amp with 200W/8 Ohm and 400W/4 Ohm.
Have a look at the input circuit, as I suppose it must be driven balanced (or have a balancing stage).
If one chip is fake, why should the others be real?
Anyhow, usually these boards are even a bargain if you replace all parts and use only the PCB.
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Hmm dangerous territory sounds both good and bad at once! What troubles me is I have never seen an example of a complete working amplifier made from one of these boards. Fake parts sounds like another landmine
Hello.
I have an amplifier with two LM 3886 and two NE 5532. Classic from ebay. We can say it´s fake. It sounds into small standspeakers. Can I increase the soundquality by original IC pieces? I feel bad "resolution" agaist TDA 7293. This is from ebay too.
I have an amplifier with two LM 3886 and two NE 5532. Classic from ebay. We can say it´s fake. It sounds into small standspeakers. Can I increase the soundquality by original IC pieces? I feel bad "resolution" agaist TDA 7293. This is from ebay too.
The problem with those boards are not only in the LM or NE but all of the components on such boards are sub par. This is comparably easy fixable (not cheap but easy) desolder all of the components from that board and carefully place it in a garbage bin. Then replace it with standard industrial components from reliable source. Low noise metal film resistors 1%, polypropylene caps and electrolytes of your choice. Obviously 5532 and 3886 need to be replaced with genuine chips. The problem with shoddy passives on such boards is one of the reasons I stopped buying them completely.Hello.
I have an amplifier with two LM 3886 and two NE 5532. Classic from ebay. We can say it´s fake. It sounds into small standspeakers. Can I increase the soundquality by original IC pieces? I feel bad "resolution" agaist TDA 7293. This is from ebay too.
I had made a small batch (21 with prototypes) of not expensive 2 way active speakers, some time ago for sale. So tried several designs fro ebay and aliexpress, AFAIR about 5 or 6 different ones. None of them where satisfying enough to let them into the finished product as is. Finally end up making my own pcb's.
Buying just a board is much smarter choice. The only part with some value on ebay or aliexpress originated boards is 0.1 and 0.22 5W fake futaba-like power resistors. They are definitely fake as having wrong pitch but very decent quality parts if you got lucky what you got, have copper leads
You believe, that budget amplifiers sounds much better then faked board amp? A lot of amp are made in China.
This is comparably easy fixable (not cheap but easy) desolder all of the components from that board and carefully place it in a garbage bin. Then replace it with standard industrial components from reliable source.
Or buy something that works from the start. Just an idea... 😉
Tom
That is not what I'm saying 🙂. I'm saying that provided device will significantly benefit if parts used to build it are replaced by quality industrial parts from known manufacturers.You believe, that budget amplifiers sounds much better then faked board amp? A lot of amp are made in China.
Usually for my taste it have severely higher price tag 🙂. And sound amplification stuff you buy from ae or ebay sellers work most of the time there is a issue with the quality of that work 🙂Or buy something that works from the start. Just an idea... 😉
Tom
But, Yes, it is completely valid idea but also this is a DIY forum 😀
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And I referring to implementations of these designsI think Tom is referring to a quality proven design that works well for DIY.
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