cheap Chinese amp modules on ebay . Anyone know what they are ?

[jives11]

Hi, while meandering around on ebay I noticed lots of 2 channel integrated amps being sold in a small package, and designed to run from a 12v supply. they cost around $20 (prices varies depending on wether or not you have free postage) and seem to come from Hong Kong.

This is an example, and I wondered if anyone knows what they use internally ?

http://cgi.ebay.co.uk/Hi-Fi-Audio-S...temQQimsxZ20081020?IMSfp=TL081020127003r10192

 

[ashok]

It says 180 W + 180 W , into 4 ohms I guess as the load impedance range is quoted as 4 to 16 ohms.
Power supply requirement is 12 V at 6 Amps. Thats 72 watts power consumption and 360 watts power output ! That means the output power is about 5 times the input power !

That explains all I guess.
😀

 

[MJL21193]

This is an example, and I wondered if anyone knows what they use internally ?

Ashok summed it up with the magical power output.

I like the specs, minimum THD - is that with the unit turned off?

 

[jives11]

Re: Re: cheap Chinese amp modules on ebay . Anyone know what they are ?

Ashok summed it up with the magical power output.

I like the specs, minimum THD - is that with the unit turned off?

amazing eh , and all for $20


😀

 

[pacificblue]

Thats 72 watts power consumption and 360 watts power output ! That means the output power is about 5 times the input power !

Yes, the heatsink size already indicates that the amp must be really efficient.

 

[opcom]

No those huge number of Watts are Chinese Watts. Not the same as RMS.

 

[pacificblue]

I recently saw a car amplifier with 10 kW output power on eBay. That's 13,6 HP at 100 % efficiency.
Add the air conditioning you need to get rid of all that dissipated heat, and a small car might be left with no power at all to move.
Of course the motor would also have to fight against additional weight from the cables you need for 10000 W / 12 V = 833,3 A plus losses.

Now, how much Chinese Watts does it take to make a normal Watt?
Maybe the demands on the car are not as bad as they seem? 😀

 

[jrn77478]

Now, how much Chinese Watts does it take to make a normal Watt?
Maybe the demands on the car are not as bad as they seem? 😀

I heard that they mix melamine in with the silicon so that the output will measure higher than it actually is.

 

[Redshift187]

Google PMPO. It's a useless rating a lot of cheap equipment is using now.

 

[MJL21193]

Google PMPO. It's a useless rating a lot of cheap equipment is using now.

And fooling the average Joe. It's at the point where a true 500 watt sub amp sounds ridiculously under powered.
HT in a box with 1500 watts! Amplified computer speakers = 400 watts.
Oh, car audio. Lets not forget about those ratings.

 

[acid_k2]

They are probably chip based (and cheap) amps.
12V, without dc/dc PS, bridged output, about 20W RMS, and a lot of THD. A great piece of blue junk.

 

[albin]

I just brought one

add up the cost of the bits you can see in the photo,possibly a free tripath chip in there.not bad.
regards
max albin

 

[Bone]

How about this one then - ebay item 380078710917
http://cgi.ebay.co.uk/500-Watt-Broa...18795QQcmdZViewItemQQ_trksidZp1742.m153.l1262

Starts off at 500 watts then 2 x 75 watts rms - what ?? - but if you read the data sheet (TA8210AHQ) is only really 20 watts per channel but at 10% distortion.
Talk about overspecification!

There are also other "interesting" items for sale by this chap!

Tony.

 

[albin]

china is strange but acceptable

how do we know?
I Love sound,anyway it comes,maybe they do to
regards
max

 

[MJL21193]

Re: I just brought one

add up the cost of the bits you can see in the photo,possibly a free tripath chip in there.not bad.
regards
max albin

Junk parts. Not worth the shipping or waiting around for it to come.
Scrap an old Technics or Pioneer receivers and you'll get some useful parts. $5-$10 at Goodwill. Better yet, leave them intact and use them. Only about a billion time better than that schlock.

 

[theAnonymous1]

Hey, someone has to keep the phenolic pcb manufacturers in business.

 

[jives11]

Re: china is strange but acceptable

how do we know?
I Love sound,anyway it comes,maybe they do to
regards
max

Thanks for the input. I'd be interested to know what's inside it. a tiny 12v based non-critical amp module is actually pretty useful. I have 3 T-amps just providing reasonable sound for PC speakers setups. With China anything is possible

 

[acid_k2]

I also like that red-brown glue everywhere

 

[albin]

a fool and his money

but it,s blue
and anodised.
look at them shiney knobs,
and small and heatsinky
regards
max albin

 

[ashok]

That Toshiba chip data ( TA8210AHQ) used in this 'red' amp says 20 watts into 4 ohms per channel at 10% distortion ! 75 ....150....500 watts ?