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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th March 2012, 02:00 AM   #2051
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Quote:
Originally Posted by b4rr3l View Post
I've got a T2 Special board using 2x STA510 and have a doubt about it.

a single STA505 is capable of delivering araound 2x 50W Full Bridge.

a single STA510A is capable of delivering around 2x 100W Full bridge as seen on T1 1.2

Normal T2 board comes w/ 2x STA505 single bridge paralled, so it's capable of delivering around 2x 100W RMS

So why T2 Special delivers the same power as the normal one using STA505?

If it's using 2x STA510A paralled single bridge it should deliver around 180W each channel at 4Ohms, so why it's only rated 2x 100W? It isn't using a single bridge configuration for each chip? Where are the other 2 channels dead?
Hi, when use same power supply and load, the T2(sta510A) will output same power as T2(sta505). So, T2(sta510A) only relives higher power when higher supply voltage or/and lower impedance load.
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Old 31st March 2012, 09:37 PM   #2052
zman01 is online now zman01  Bangladesh
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Originally Posted by platenspeler View Post
[*]A PGA2311 pre-amp module with LCD display (eBay), 3 inputs and remote control. I really like this preamp module wich is dead quiet
Maarten,

Which module is this? Can you share please.
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Old 31st March 2012, 09:58 PM   #2053
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At the moment there are at least 20 kits/assembled boards offered on Ebay, most are the same board sold as kits or assembled by different vendors and sometimes with different components or firmware. Please search on pg2311 and skip the IC's and look for the boards. The latest version has a memory function which remembers the last input/volume setting after a power off/on cycle.

Example of PGA2311 board with memory function

Click the image to open in full size.

Maarten

Last edited by platenspeler; 31st March 2012 at 10:18 PM.
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Old 31st March 2012, 10:11 PM   #2054
zman01 is online now zman01  Bangladesh
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Thank you Maarten for your quick and informative reply.

-Zia
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Old 1st April 2012, 01:42 PM   #2055
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@Maarten,

I know these PGA2311 boards. Fine solution with this type of controllers. The problem I see here is to cut a matching frame into a chassis. Or are these standard dimensions ... ? Would be glad if you success with an implementation and demonstrate us here.
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Old 1st April 2012, 03:34 PM   #2056
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Originally Posted by TheDealer View Post
@Maarten,

I know these PGA2311 boards. Fine solution with this type of controllers. The problem I see here is to cut a matching frame into a chassis. Or are these standard dimensions ... ? Would be glad if you success with an implementation and demonstrate us here.
See post 2031 of this thread. The case was made of steel and indeed cost me a lot of trouble to cut the hole for the display. The display sticks through the hole in this case. Maybe next time I would have made the hole a little smaller and have the display attached behind the front plate.

This should be a lot easier when using aluminum boxes, especially when cutting a slightly smaller hole than the display. Only when the frontplate is 10mm thick this will again be tricky. Some sellers will make such holes on request and I'm seriously considering going that route for one of my next projects.

BTW on ebay there are "standard" chassis available for this board.

regards,

Maarten
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Old 1st April 2012, 03:59 PM   #2057
zman01 is online now zman01  Bangladesh
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Maarten, TheDealer,

How transparent are these pre-amps? What type of coloration do you hear them adding?

-Zia

Last edited by zman01; 1st April 2012 at 04:05 PM.
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Old 2nd April 2012, 02:49 AM   #2058
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Originally Posted by platenspeler View Post

BTW on ebay there are "standard" chassis available for this board.

regards,

Maarten
I think I have also seen these. They were silver colored if I am not wrong. But you can use them only as a pre-amp chassis and it should nearly impossible to integrate a bigger powersupply and the Tripath pcb in same chassis.
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Old 2nd April 2012, 02:52 AM   #2059
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Originally Posted by zman01 View Post
Maarten, TheDealer,

How transparent are these pre-amps? What type of coloration do you hear them adding?

-Zia
sorry, I just have said that I know/read about them. Sadly I cannot give any experiences
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Old 2nd April 2012, 08:16 AM   #2060
alkasar is offline alkasar  France
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Quote:
Originally Posted by zman01 View Post
Maarten, TheDealer,

How transparent are these pre-amps? What type of coloration do you hear them adding?

-Zia
as transparent as a resistor
As long as you use pga2310/11 below 0dB, it's a passive attenuator.
From 0 to +36dB there is an opamp included, based on opa2134. It is quite good, but you may or not like. I don't care as I use it only as passive. Modern dacs don't need preamp gain.
These boards have a dc blocking cap. I simply bypassed them.
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