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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th August 2010, 08:09 PM   #581
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Quote:
Originally Posted by hifimediy View Post
Hi, I was working on a new 2.1 channel amplifier for days. It's DDX and input S/PDIF directly ( so it's a power DAC actually) .
As a system, I add a mcu and HID like LCM, remote receiver and rotary encoder, etc.
I just think that will be another interesting project. Any ideas?
What type of crossover would there be between the speakers and the subwoofer (high pass, low pass, etc.)? Could the frequency be set digitally? If so, then this amp could be perfect for PC users, particularly those of us who listen to music almost exclusively on our computers.

I don't know how the DDX chip sounds compared to the Tripath, but if the two are more or less similar in quality, so much the better. Thoughts?
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Old 12th August 2010, 09:41 AM   #582
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Originally Posted by SoldierAnt76 View Post
What type of crossover would there be between the speakers and the subwoofer (high pass, low pass, etc.)? Could the frequency be set digitally? If so, then this amp could be perfect for PC users, particularly those of us who listen to music almost exclusively on our computers.

I don't know how the DDX chip sounds compared to the Tripath, but if the two are more or less similar in quality, so much the better. Thoughts?
It's 2nd-order low path crossover, with frequency configurable(by digitally).
It's good in my test, but we will test more when the first sample come out.
Test with a AMT2050 board(just power stage using) and a digital board:
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Old 12th August 2010, 07:12 PM   #583
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Which DDX chip are you using?
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Old 12th August 2010, 07:40 PM   #584
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Quote:
Originally Posted by hifimediy View Post
Hi, I was working on a new 2.1 channel amplifier for days. It's DDX and input S/PDIF directly ( so it's a power DAC actually) .
As a system, I add a mcu and HID like LCM, remote receiver and rotary encoder, etc.
I just think that will be another interesting project. Any ideas?
SPDIF Input? How would someone use this in a home setup, is this more for a computer? What DAC chip is being used?
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Old 12th August 2010, 11:41 PM   #585
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Originally Posted by sendler View Post
low level noise when two separate boards are run off of one power supply. Even batteries. It is like a ground hum but higher in frequency. Some people call it a whistle.
I can confirm that from Arjens Combi constisting of the tubebuffer V2 + TA2020 MkIII amp board. When I supplied both with a SMPS (two separate +/- 12 V outputs) I just only notified the ground hum.

Connected a battery which supplies both over its one output terminal resulted in this loud whistle + the ground hum out from the speakers. But the whistle decreases a bit after a while. From one speaker I could notify that the whistle became up and down and finally it was reduced to an acceptable level. With high sensitivity speakers you can hear the whistle from your listenning postition. Very loud ...


But maybe you can help me as an more experienced DIY:
Can it be that a tube is responsible for distortions ? - especially human voices sound scratchy. Without the tube buffer V2 I can definetly listen out more punch and less distortions. I think the tube buffer would fail completely if something is wrong with it, or ? Arjen told me that a tube as reason is rare but potential ... Can you confirm that ?



Quote:
Originally Posted by sendler View Post
Board and fins oriented vertically.
I also supect the "air spaghettis" acting like antennas. The more you have the more you listen radio

Last edited by TheDealer; 12th August 2010 at 11:45 PM.
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Old 13th August 2010, 12:27 AM   #586
sendler is offline sendler  United States
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Default Tubes

Sorry, I don't use tubes.
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Scott
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Old 13th August 2010, 01:29 AM   #587
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Quote:
Originally Posted by SoldierAnt76 View Post
Which DDX chip are you using?
Quote:
Originally Posted by wushuliu View Post
SPDIF Input? How would someone use this in a home setup, is this more for a computer? What DAC chip is being used?

There are 3 path input S/PDIF signal: Coaxial, Optical(toslink) and USB. sta320 used as DDX chip which can output PWM pair and drive power stage IC.
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Old 13th August 2010, 03:16 AM   #588
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Originally Posted by sendler View Post
Sorry, I don't use tubes.
.
Why not ? Is it more technical or taste depended ? In pre stage for the most poweramps it makes sense but in the other hand I donīt see any urgent need for at least smooth Tripaths.
------------------------------


And guys excuse me if I am crossing a bit off topic at moment ...

Last edited by TheDealer; 13th August 2010 at 03:19 AM.
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Old 13th August 2010, 09:48 AM   #589
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@hifimediy
Cool project......I shall stay tuned. When do you think the new board will be available?
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Old 13th August 2010, 10:00 AM   #590
alkasar is offline alkasar  France
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Quote:
Originally Posted by hifimediy View Post
Hi, I was working on a new 2.1 channel amplifier for days. It's DDX and input S/PDIF directly ( so it's a power DAC actually) .
As a system, I add a mcu and HID like LCM, remote receiver and rotary encoder, etc.
I just think that will be another interesting project. Any ideas?
nice project. all-in-one
don't you want to start a dedicated topic for this ?
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