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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th June 2008, 10:34 AM   #1
cac liu is offline cac liu  China
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Wink The Full Digital AMP

Has anyone ever try the APOGEE full digital AMP?

The DDX-8001 or the DDX-8000, I had just did one ,It is great.

http://bbs.hifidiy.net/viewthread.php?tid=140077
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Old 11th June 2008, 03:08 AM   #2
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I have never heard of it. Out of curiosity, what does this mean? The pulse width is controlled digitally? Sounds like a good idea to me.
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Old 12th June 2008, 06:01 PM   #3
cac liu is offline cac liu  China
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yes,it is amplify digitally,like a DAC can amplify.
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Old 13th June 2008, 03:26 AM   #4
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Default Re: The Full Digital AMP

Quote:
Originally posted by cac liu
Has anyone ever try the APOGEE full digital AMP?

The DDX-8001 or the DDX-8000, I had just did one ,It is great.

http://bbs.hifidiy.net/viewthread.php?tid=140077
I've got two of the Spherex 5.1 XBox amps, which use the DDX-8001. I was able to piggy-back a board that has a micro and USB interface. So far I can control the volume from a VB.net application. Working on the biquads next.

The current version of the chip is the STA-30813, successor to the STA308. ST has sold a lot of these chips and they are used in many home theater systems. I wish I knew which ones so I could buy them to re-use the amplifier boards. The JVC model TH-S2 uses the STA308 and I know that at least one budget RCA amp used the same chip.

These are very nice amps, and with 10 digital biquads you can build some nice crossovers and do a lot of EQ.
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Old 13th June 2008, 11:20 AM   #5
cac liu is offline cac liu  China
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Yes,it sounds very nice!
the DDX-8001 has 8 channels,The AMP board I used is a 6 channels AMP+2 channels Phone AMP

Just use the DDX-8001 ,you can achieve all the functions.
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Old 11th July 2009, 05:28 PM   #6
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Quote:
Originally posted by cac liu
Yes,it sounds very nice!
the DDX-8001 has 8 channels,The AMP board I used is a 6 channels AMP+2 channels Phone AMP

Just use the DDX-8001 ,you can achieve all the functions.

Hi Cac,


I have find the firnd the source of DDX-8001, I cannot find the digital input. Can you tell me how to find it?


Thank you.
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Old 16th July 2009, 01:03 AM   #7
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Hi CAC,

Sorry can't read chinese. Where did u get these? Is there a kit or full unit available?

Oon
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Old 16th July 2009, 11:38 AM   #8
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Quote:
Originally posted by oon_the_kid
Hi CAC,

Sorry can't read chinese. Where did u get these? Is there a kit or full unit available?

Oon

I think it is demo PCB. I use Google translate.(See below). Hoped that you can understand.



http://translate.google.com/translat...istory_state0=
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Old 16th July 2009, 02:40 PM   #9
wwenze is offline wwenze  Singapore
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I can read Chinese, if you need any help in translation. Coz the Google translate doesn't work.

Quote:
此板为六声道全数字功放板。是现时最新的功放技术。不 需要另外使用DA转换。直接把CD机DVD机或USB声卡的I2S 中藕抛晃β手苯忧取R糁什皇且话愕腄类或 AB类所能比的。此板是由三块DDX2100(在铝散热片的下 妫┖鸵豢镈DX8001构成的数字功放.功率为6*50W.也可自 焊淖俺3*100W使用.电源采用32V和5V两组电源供电.功放 板全新.但是要注意的是,此板不能直接使用.需要自已动 手联接电源与数字接口。我自已的已搞响,使用光纤输入 ,51单片机控制增加了一块LCD液晶屏,七个按键,一个3 60度的音量调节。,可以提供一定的技术支持。J3接口上 标的定义依次为:MUTE_HP MU2100 GND SCL SDA RST MCK LRCK BCK SDA2 SDA1 SDA0 GND。两块以内快递费15.00元
This board is a 6-channel fully-digital amplifier board. The newest form of amplifier technology (yeah rite). DA conversion not required. Converts the I2S digital signal from CD DVD or USB sound card into power to directly drive speakers. The sound quality is far better than a typical class-D or class-AB amplifier (yeah rite again). This board is a digital amplifier consisting of three DDX2100 (underneath the heatsink) and one DDX8001, output power 6 x 50W, can be modded to 3 x 100W (bridgable class-D? interesting). Power supply is 32V and 5V. Boards are all new, but take note, this board cannot be used on its own, need to connect the power supply and digital signal input yourself. I've done up my own using optical in, 51 cd player control with an additional LCD display, 7 buttons, a 360-degree volume control., can provide some technical support. J3 connector pinout as: MUTE_HP MU2100 GND SCL SDA RST MCK LRCK BCK SDA2 SDA1 SDA0 GND. Courier @ $15 for two pieces and below.
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Old 16th July 2009, 04:46 PM   #10
hoka is offline hoka  Netherlands
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I want one of these but how do you buy on that site?
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