Simple little Class-D modules (V-MODULE VMA2015)

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#21
Congratulations! Question: where can I get info about actual power supply range of my actual chips? DS says they can operate from 12 V up to 18 V, so I was sure it legally concernes to my modules... ???

***
GOOD impression has remained from test listening. Sourse: cell-phone with mp-3 player; load: a pair of two-band 8 Ohm stereo systems with 5" bass drives of compression type (25 x 30 x 45 cm case); pwr supply: 14,5 V AC/DC with BIG filtering capacitors. Room 2,5 x 4 x 6 m with well sound absorbed walls and ceiling.

Loud, clear, natural (common bear-eared evaluation of course) sound. IMHO there is no sound differencies from ordinary analog amplifiers. Pleasant bass. Pretty low background noise. No thermal dissipation (finger as a sensor; 23 C ambient). Four hours in near max volume - no heating has been noticed.

Nice thing for proper price I guess. It will be a part of my low budget car-audio system with GPS navigator as an audio source.
 
#25
schabanow.. and others who have tried the vma2015 / vma2016 modules: could you please give us more feedback on sound quality you obtained from these devices ?
Click & pop a start-up or shutdown? (I would like to use this amp with my active crossover).
 
#27
Please

yopi3622 said:
schabanow.. and others who have tried the vma2015 / vma2016 modules: could you please give us more feedback on sound quality you obtained from these devices ?
Click & pop a start-up or shutdown? (I would like to use this amp with my active crossover).
Click to expand...

UUUUUP!:up:

Please...could anyone post some deeper feedback...or a little review-comparison between it and -for example- TA2020?
 
#28
Why not sticking it to PC?

Well,

It's a digital amplifier and can accept "dirty" PC power... or I guess so...

So, just a PCI or PCIE (false or with only power lines) slot could provide enough amps to run this baby and off you go: plug it in slot and you got about 2X10 watts amplifier which TURNS OFF together with your PC!
Now a question:
Is this a compliantly stupid idea or could a digital AMP run from 12v computer supply?
😕
 
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#29
Computer Power supply is a no go!

Unfortunately, computer PS leaves the amp with lot of NOISE!!!
whilst with HP notebook PS (20v 3,5A) it works like a charm!
No noise (subjectively of cause), a very good sound quality as I can tell...

I just want to call it a "spy amp" for being so small and yet pumpy...
 
#30
theAnonymous1 said:
Haven't seen anything like this before; little micro Class-D modules with almost no external components required. Obviously not a candidate for any Hi-Fi awards, but interesting none the less.

DealExtreme: $7.80 VMA2015 15W Mono Audio Amplifier Module

http://v-module.com/file/20100702110642-DS_VMA2015.pdf
Click to expand...

and how sweet they are ...🙂 And really no caps needed ?? It´s hard to imagine that these will make speakers sing in appropriate quality for audiophiles.
I am curious about a comparison with a well made TA2020 system which are with 200 gramms weight 100 times heavier than these micro modules ...
 
#32
Capacitor.

Hi there!
I bought one evaluation module for the VM2012 in dealextreme and it works like a charm for the price... but, I was thinking about the 1000uf Rubycon cap that it comes with... isn't it too small? Wouldn't it be better to put some more smoothing capacitance there?

Thanks in advance.
 
#33
It depends on which PSU you are using! If you are using a toroidal with only rectifier bridge, of course this capacitance is too little...in this case it would be better if it were about 5 or 6 time bigger; on the other side, if you power the amp with a pre-filtered PSU, theorically this 1000uF cap is useless...finally I think that if you power it with a notebook SMPS, it should be ok...but, if not difficult, I would try to change it with a bigger cap...surely it's not a damage! But then remember to post results!

Just my 2c...;-)
 
#35
Hiper said:
And what do you think about powering it by USB?
I am planning to make a portable guitar amplifier with it, adding a simple preamp.

Any speaker recommendations?

Thank you!!
Click to expand...
USB is impossible!
The amp needs minimum 10v power and USB has only 5V
also: the Amperage of USB would not be enough to kick this amp on maximum extent.

cheers,
tinto
 
#37
Tinto said:
USB is impossible!
The amp needs minimum 10v power and USB has only 5V
also: the Amperage of USB would not be enough to kick this amp on maximum extent.

cheers,
tinto
Click to expand...

I fully agree...:up:

audiotest1 said:
no output LC filter , can it pass the EMI/EMC ?
Click to expand...

This chip should be designed to not require any external low-pass filter...
So this means that high switching freqs shouldn't be in the output signal.
 
#38
Hi!

About the USB thing, you should read my first post, I was talking about VMA2012
VMA2012-2x3W Class D Audio Amplifier Product Details, a 2x3W amplifier. I'm powering it by USB and works properly.

VMA2015, mono 15W. I agree, a 5V 500mA source is too short : ) for that one

Sorry about the inconvenience, I read the post was about an VMA module and I thought it would be in the context to talk about my VMA2012.

Do you know any nice and small 3W speaker? : )

Thank you for your replys : )))
 
#40
Popping noise at powering up

Hi everyone,

My VMA2015 evaluation board ( Wholesale VMA2015 EVB15Wx2 Mini Class D Audio Stereo Power Amplifier Board ) makes one powerful "click" at connected speakers after about 0,5 seconds from supplying power. when powering off everything is OK though...
The MAX9703 ic, which is inside this amp, says that it has "industry leading click and pop suppression"...
Does anyone with same product experience similar problem or is my amp probably malfunctioning?

any input is highly appreciated!
Thank you
 
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