does anyone know this amp? Mosfet 80W *2

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
S

seth_space

Member
2009-12-27 2:11 pm
I am not able to find any info regarding this amp:
High End Audio Power Amplifier HiFi Stereo Headphone Amp MOSFET 80Wx2 Silver New

Some insights?

Brand: Douk Audio
Bluetooth Version: 5.0
Color: Black
Technology: Aluminum alloy integration
Channel: 2.0
Output Power: Max. 2*80W
Power Voltage: 12V-14.5V
Impedance: 2-8Ω
Distortion: 0.008%
Frequency Response: 6Hz-80KHz -3db
Conversion rate: 240V/us
Size: 130mm*130mm*40mm(5.12*5.12*1.57 inches)
Net Weight: 1.2kg (1.8Kg with Package)
 
Ian Finch

Ian Finch

Member
Paid Member
2010-04-11 4:22 am
Coffs Harbour, NSW
2 x 80W for a headphone amp? Size: 13 x 13cm x 4cm and weighing 1.2 kg? The seller is a joker. The power supply may increase the mass but it's obviously switchmode. The amplifier would also need to be class D to be rated for 80W/channel. Considering the supply voltage, the design is probably based on an automotive power amplifier. They usually require the use of 2 ohm or lower load impedances to achieve their ratings which are dodgy anyway....Meh!

I'd also like to see how the excess heat from producing 160W of audio, whether its peak or continuous rated, can escape the case. It would require a fan to be rated even for peak RMS capability but who would tolerate a tiny, noisy fan to listen to hi fi?

It could be a nice little box to hide away somewhere near the workbench but put something heavy and heat conductive on it if you intend to fit good cables - They would be strong enough to throw it around like a cheap plastic hobby box if you try to use this amplifier in the living areas when typical domestic activities like cleaning moving stuff about, kids or visitors are around etc.
 
U230421

U230421

Disabled Account
2017-02-07 1:54 pm
80W on 14Vdc can be done on load of 1.25 ohms. Gives 8A~ and 11.2A peak.
In stereo that's over 22A.
Look at the power connector. Rating is 2, maybe 3A. The power switch... 1-2A capable.
You bet.
Nice shining case. Throw out the internals and make it a proper head-, headphone or small class A amplifier out of it. There is a separate chapter about Pass designs here for good ideas.
 
Last edited:
S

seth_space

Member
2009-12-27 2:11 pm
Not sure about that last remark.
( 1* Power Supply(12V 10A) ) so 120Watt is available to the amp.
Impedance: 2-8Ω

so the 80 Watt figure probably is linked to the 2 ohm use. But still.
It's not a class d i guess, only Mosfets.
But as stated, no review or any functional info to be found..
 
S

seth_space

Member
2009-12-27 2:11 pm
not sure if i understand your remark.

The DC "power" is 12Vx10A =120Watt. available to the AMP.
Of course still no 160Watt ( RMS?, Peak power? not stated, so probably the famous: PMPO )
I do not know the AC power consumption, that would depend how efficient the AC/DC Adapter is.
 
Ian Finch

Ian Finch

Member
Paid Member
2010-04-11 4:22 am
Coffs Harbour, NSW
I think you will find that this is one of Nobsound's own products which are "digital" amplifiers. That really means its a tiny class D amplifier, not AB or digital in any way. I guess the higher price is also due to a custom case and up-market features, probably also a BTL design, as suggested by the promotional blurb, though the benefits seem vague and unexplained, which tells me either the author needs help with audio electronics or is just waffling.

"This is the latest power amplifier of Nobsound with amazing appearance and strong function absolutely different from most amplifiers on the market. It has dual-balance circuit design to achieve low interference & loss and HiFi stereo audio sound"
Compare with this simple description:
https://www.ebay.com.au/i/253270079...Tn3pD8Q_Ek-DQC9N9RguK5chXEiIUiQBoCXWMQAvD_BwE
 
S

seth_space

Member
2009-12-27 2:11 pm
found a inside picture of the 100Watt variant.
H06a47aa181014911bb8a253db3aa6f3bB.jpg


sketchy.. the site named on that amp has no access.
www.audience.net.cn

2019 High End Bluetooth 5.0 HiFi USB Audio Power Amplifier Stereo Headphone Amp MOSFET 100W*2-in Amplifier from Consumer Electronics on AliExpress - 11.11_Double 11_Singles' Day

and i found two youtubes with little info.
YouTube
YouTube
 
Last edited:
2

29285

Disabled Account
2010-01-17 9:20 pm
In the left lower corner the power amp is visible on a heat coupler connecting to the metal case. Looks like some car-audio AB amp from STM or any clone of that. Maybe there is some step-up converter on its right side?
 
Last edited:
M

Mark Tillotson

Member
2018-05-27 10:37 am
Cambridge UK
voltwide said:
In the left lower corner the power amp is visible on a heat coupler connecting to the metal case. Looks like some car-audio AB amp from STM or any clone of that. Maybe there is some step-up converter on its right side?
Click to expand...
No need for a step-up converter - and on looking at the package again its more likely to be an amp like the TDA7851 than an IPM. The 4 input capacitors are a fit for that. The two daughter boards probably have opamp/filter circuitry, presumably including phase-splitter as no large package can be seen, probably SOT23 opamps and passives.


TDA7851 (may not be exactly this, but similar specs)
http://www.farnell.com/datasheets/2...qh0dVU5m9UdR3olcGt_i_rFRFooxv05xoCmcYQAvD_BwE
 
Last edited:
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom