how do you build direct digital amp

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#21
sofus79 said:
please look at the core audio link
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Look at it yourself. All the information is there.

You need a PC with standard interfaces in a nice enclosure, add as many channels of class D amps as you wish, create an interface from the PC to the amps and then write a software to do the signal processing and the conversion from PCM to PWM.

Before you do that you need to study electrical engineering and programming in high level language followed by a few years of work as circuit designer and as software designer to aquire sufficient experience. Maybe you should also invite some friends to do the same and team up with them for the project, because the amount of work may be too much for a single person.

Oh, and you may need a lot of money not only for the project as such, but to buy patents and licences, too.
 
#26
sofus79 said:
if its only for my self i dont need too buy patents and licences right
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From a legal point of view you have to. Of course you may ask the patent or licence holder for a special permission. Some of them grant it, when you convice them that you don't make money from using the patent. Others don't allow it on the grounds that you will at least buy one item less from them, if you make your own.
In some cases paying a licence fee is the only way to get the information you need.

But to come back to that link. Just forget it. A 2x20 W class D amp for 1000 US$? Magnetic pull on ground that sucks noise away from the power supply circuit? Come on!
 
#31
please i don't know anything about mechanical engineering but I would like to build a car like those one Accueil - site officiel Maserati France can you help me?

Seriously as said by pacific blue you need to study first, because yet it seems you have no clue how to do anything!

I am currently thinking about building a class D amp by myself inspired by some international rectifier provided design + a FPGA for signal processing (as I know best FPGA than DSP or µC) but for those who believe is not possible to make an amplifier without DAC and think it is only marketing ******** they just don't know that class D is all about converting digital signal to analog without DAC but using PWM modulation.
 
#32
sofus79 said:
so i dont know if i just should buy his harmony server 2 or make somthing my self
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The answer depends on your personal intension.
a) Do you want to have such a system?
b) Do you want to build such a system?
c) Are you passionate to learn how to design such a system?

Answers:
a) Just buy it.
b) Buy five of it, build one copy. Or check with core audio for a KIT.
c) Stop working and spend 5-6 years on learning theory and practise of general electronics, digital signal processing and switch mode power systems + spend massive money on equipment and components.
 
#33
sofus79 said:
do you have any other suggestions i really want to make a pc amp thing for my speakers
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The easiest way is to follow post #20. Buy a PC with the interfaces you need. Buy as many class D amps as you need and connect them to the PC.

Free software crossovers are available on the Net.

sofus79 said:
he says that its better then LYNGDORF Millennium Mk IV and that his harmony server has better power supply etc
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Of course he does. He wants to sell that stuff for a lot of money.
 
#37
sofus79 said:
i am early retired so time i have a lot of
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That's a good starting point 😎

Class D amps components with digital inputs are becoming available from multiple manufacturers.
At least Diodes (Zetex), TI and Infineon do have such.
In detail the appoaches differ pretty much. As far as I see the TI approach is to use a PWM processor that feeds their digital power amplifier stages.

Digital Input Class-D Power Audio Amplifier with DSP - Infineon Technologies

PWM Processor from Texas Instruments

http://www.google.de/url?sa=t&rct=j...1qm9BA&usg=AFQjCNHt0fejH_q8q9oY6DhBkoFuqv3PUg


To get components you will need a combination of checking with the manufacturers directly and/or distributors, shops.
An extremely large component portfolio can be found at
Electronic Components Distributor | DigiKey Corp. | US Home Page - if you are rich and don't mind extra charge for the customs fees + high shipping cost.

The design itself must come from yourself/friends and application notes, because only very few people here will have a working design on hand. And those who have, most likely won't release here now. May be in 5 years, when it has established as standard technology.
Most likely some digital natives here will support you, if you show your design and come up with detailed questions.

It might also be worth to search for amplifier modules with digital inputs and digital PWM processing that can handle the signals from sound streamers like the squeeze box or similar and digital outputs from CD players.
 
#40
The easy way

buy the whole stack from Home | miniDSP. Now you have 2 or 4 channel direct digital emplification and 4 channel DSP crossover. Take a cheap nvidia ion based motherboard (mediacenter mobo) and a SSD disk and you are up and running.

That is kind of what I have except for the SSD.

For more power and a bit more complex, look at TI evm boards like this

TAS5631DKD2 Evaluation Module - TAS5631DKD2EVM - TI Tool Folder

Or a readymade product, just add a PC

Wholesale DSP+CLASS D AMP+SMPS 2.1 OR THREE WAY HI FI AMP WITH ANALOG/SPDIF/USB SOURCE SELECTOR
 
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