how do you build direct digital amp

[kclo4]

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.

[ChocoHolic]

Originally Posted by sofus79

so i dont know if i just should buy his harmony server 2 or make somthing my self

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.

[pacificblue]

Originally Posted by sofus79

do you have any other suggestions i really want to make a pc amp thing for my speakers

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.

Originally Posted by sofus79

he says that its better then LYNGDORF Millennium Mk IV and that his harmony server has better power supply etc

Of course he does. He wants to sell that stuff for a lot of money.

[Speedskater]

This sub-forum is all about analog chip amplifiers, nothing digital here.

I just noticed that in my post #17, I was confused about what sub-forum this was.

[sofus79]

alright i cant find the ti link can you send it again
i am early retired so time i have a lot of
and the parts please send a link and help me find the parts i need
sorry for bad spelling and thanks for all the help you can give

[pacificblue]

Originally Posted by Speedskater

This sub-forum is all about analog chip amplifiers, nothing digital here.

I just noticed that in my post #17, I was confused about what sub-forum this was.

You weren't. See post #28.

[ChocoHolic]

Originally Posted by sofus79

i am early retired so time i have a lot of

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&...6DhBkoFuqv3PUg


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.

[sofus79]

thanks great links

[sofus79]

stupid quistion again if a motherboard has pwm can i then connect it direct too the amp because one said that i have convert pcm to pwm

[Kjeldsen]

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