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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st June 2009, 02:39 AM   #91
ttan98 is offline ttan98  Australia
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Quote:
Originally posted by panomaniac
A question:

ttan asked me to look this over as I have experience with this chip set. But should I be looking at the board with one power chip or two? They are a bit different.
Thanks for taking a look at this chip set, I assume looking at the Virtue Amp you were holding and explaning the virtues of this amp from YouTube that it is based on a single TA2050. I will be buying the dual version.

So far I have purchased 4*12V batteries to power up this amp, arranged in series and parallel. Also the necessary parts to design a smart charger for these batteries altogether less than US$80(cheap and worthwhile to check it out(*)). If there is significant improvement in the sound quality over the SMPS then I sure will report here.

Cheers.


* Danny from GR research reported significant improvements.
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Old 1st June 2009, 09:02 AM   #92
ElFishi is offline ElFishi  Europe
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Quote:
Originally posted by panomaniac
A question:

ttan asked me to look this over as I have experience with this chip set. But should I be looking at the board with one power chip or two? They are a bit different.

2 chip, pls.
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Old 1st June 2009, 12:47 PM   #93
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Default pic1

Well here is my board in case, still isn't completely finished.
The board with this big heatsink doesn't go over 30°C, I also changed output coils to 10uH and caps to 470nF.
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Old 1st June 2009, 12:49 PM   #94
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plexi glass case
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Old 1st June 2009, 12:50 PM   #95
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Default pic3

Two led psu giving out 24V 3.4A
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Old 1st June 2009, 01:05 PM   #96
ttan98 is offline ttan98  Australia
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Default Re: pic1

Quote:
Originally posted by mravlcax
Well here is my board in case, still isn't completely finished.
The board with this big heatsink doesn't go over 30°C, I also changed output coils to 10uH and caps to 470nF.

Hi,

where you get your toroid inductors that fit in also perfectly? How do feel assured that these toroids are of good quality? Is you PCB 2*50W or 2*10W version?

please report back how it sounds.

thanks.
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Old 1st June 2009, 01:52 PM   #97
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Default Re: Re: pic1

Quote:
Originally posted by ttan98



Hi,

where you get your toroid inductors that fit in also perfectly? How do feel assured that these toroids are of good quality? Is you PCB 2*50W or 2*10W version?

please report back how it sounds.

thanks.
Well I had these coils laying around and they have thicker wire than those stock coils, thats the reason I changed them. My board is 2*100W version and it sounds great for the money that was put in the project. I compared it to a solid state amp that uses 2sc5200/2sa1943 on output and has all high quality components(dale resistors, nichicon muse, silver mica, jantzen superior z on the input, etc). This amp has natural sound and the highs are very relaxed compared to this sure amp which has a bit aggressive highs but it has better bass. Overall I can say that the solid state amp is better. The test was done on the tannoy m1 modified speakers and the source was asus xonar D2 soundcard.

Regards Aleš
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Old 1st June 2009, 07:00 PM   #98
gychang is offline gychang  United States
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Quote:
Originally posted by audio1st



It is silent...
This is the Sonic Impact with impact!
This to me beats the Gainclones that I have built, fantastic detail with slightly less warmth than the GC's. Large soundstage..

I've ordered a second.
This is very helpful comment, is there a pictorial summary of what can be done to improve the sound?, I am a newbie with solder gun...




Quote:
Originally posted by panomaniac
It's a switching amp, there is already a ton of noise.
Batteries are OK, but a good switching or linear supply often sounds better - for power amps.
And batteries are not as quiet as you might think....
Is there a DC adapter from a web site link that would be good for this?

gychang
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Old 2nd June 2009, 11:20 AM   #99
gychang is offline gychang  United States
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Default Re: pic1

Quote:
Originally posted by mravlcax
Well here is my board in case, still isn't completely finished.
The board with this big heatsink doesn't go over 30°C, I also changed output coils to 10uH and caps to 470nF.
basic newbie question, what compound do u use to "glue" the heat sink to the chip? Does the stuff used for CPU ("thermal silver??") also has the glue properties?

thanks,

gychang
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Old 2nd June 2009, 03:40 PM   #100
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My heatsink is so big that it can't be just glued to the chip. It is screwed from the bottom side. If you look at the picture on sure page you will see two holes and between the chip and heatsink is ordinary thermal paste also used for cpu. You were also asking which DC adapter to use, I suggest something that has 24V and 5A. My psu is a bit underrated but I don't listen very loud.

Regards Aleš
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