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Old 30th June 2015, 04:31 AM   #1
Kordoz is offline Kordoz  Slovakia
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Default Assembled mosfet amplifiers from ebay

Hi!

I would like to build some mosfet Hifi amplifier, please do anybody has any experience with some assembled boards, like:


Assembled MOSFET Power Amplifier Board with Angle Aluminum ?2 Boards L155 36 | eBay


L12 2 Power Amplifier 2 CH Assembled Boards Heatsinks | eBay


Assembled A2 FET Fully Symmetrical Power Amplifier Board TT1943 TT5200 SN | eBay


I'm looking for high quality amp, with low noise and wide frequency bandwith.

thanks
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Old 30th June 2015, 07:17 AM   #2
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If you want high quality, start here but the real quality is your power supply and build.
L12-2 CFP Output amp 120W*2 8R
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Old 30th June 2015, 07:45 AM   #3
Kordoz is offline Kordoz  Slovakia
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Thank You for reply!

So this amp is best I can get?
Do anybody has tested it how it plays?


Please how should look good power supply? Please any wiring diagram?

many thanks
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Old 30th June 2015, 09:08 AM   #4
Kordoz is offline Kordoz  Slovakia
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Please, what about this universal PSU board?

F6 Universal Power Supply Board Speaker Protection for Amplifier Board 15 36V | eBay

is it good for this amp?
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Old 30th June 2015, 10:53 AM   #5
CBS240 is offline CBS240  United States
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Quote:
So this amp is best I can get?
Do anybody has tested it how it plays?

For a cheap price, you get a cheap amp. It is what it is, and it may be a good deal for certain applications, but it requires additional circuitry to be a complete amp. Interfacing different projects can be tricky. I would not connect your $1000 high end speakers to it as without some comprehensive protection circuits, a $1 transistor failure could spell the end of those expensive high end speakers. Also it appears you need a power supply.
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Old 30th June 2015, 01:09 PM   #6
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Looked at the Vfet amp and the PS. WOW !

To-92 driven non gate- protected IRFP's and "figure 8" grounding on the PS !

I'm sure they would work , but safety/SQ/ and durability seem to be
secondary here.
Screw Ebay - 9/10 purchases , you have to file for a refund. Online
"dollar store" .

Edit - the "A2" does not look as bad (for a vfet amp).

OS
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Last edited by ostripper; 30th June 2015 at 01:14 PM.
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Old 9th July 2015, 11:45 AM   #7
Kordoz is offline Kordoz  Slovakia
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here is some project with this amp:

https://sites.google.com/site/steves...ower-amplifier
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Old 9th July 2015, 01:33 PM   #8
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When National (now TI) came out with the LM4702, followed by the LME49830 the company did a comparison using various output devices. The best output MOSFETs were the 2SK1530/2SJ201 -- you can see the results on TI's website. At any rate, there is a fellow selling assembled 100W boards using the LME49830 driver chip and the Toshiba output devices -- grab this one as these MOSFETs are going to be unobtanium:
LME49830 2SK1530 2SJ201 Installed Mono 100W DC Servo Amplifier Board | eBay
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Old 25th August 2015, 08:38 AM   #9
Kordoz is offline Kordoz  Slovakia
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Yesterday I have finished build of LJM L12-2, with F6 universal power and speaker protection board. It really plays fantastically, pure and powerfull sound. I had some problem with system hum from speakers, but after connecting of toroid ground to power board and PE of AC 220V, it almost came out, still some, I need to shield toroid I think, it i s too close to amp module.

Ian Finch thanks for an advice.
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Old 25th August 2015, 09:19 AM   #10
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Good that you enjoy it Several others in the thread agree with you too. For a compact and cool running amplifier module, I think it's the best I've ever seen and heard for a budget DIY product. Those LAPT output transistors probably have something to do with that
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