diy class D resources

[Jared]

can someone point me in the right direction? So far all I can find are switching power supplies, but no class D output projects.
Boards, schematics, kits, plans, anything would be appreciated.

 

[sonnya]

look at this :

http://www.zetex.com/3.0/design-guide.asp

http://www.zetex.com/audio/

It is a fairly simple design, for power level up to 100W into 4Ohm (ZXCD1000MOEVAL).

Sonny

 

[Christer]

ZapPulse from LC Audio, perhaps?

www.lcaudio.dk

 

[pinkmouse]

National Semiconductor do a driver and an output chip, I haven't looked closely, but they are usually good for data sheets and ap. notes, as well as having a good sample policy

Yup, try this-
http://www.national.com/pf/LM/LM4651.html

 

[Jared]

zap pulse link does not work ??

I didnt realize there was a class D overture solution !
This is pretty exciting, but there seems to be a bit of a noise issue at high power. It looks lke 100w@4 ohm is .3%distortion which seems like ausable max? this is under 200 hz signals only tho, so it should not matter as much?

can this chip be bridged like the other overture chips?

 

[seangoesbonk]

Check out the TI components on this page:

http://focus.ti.com/docs/browse/productnavigation.jhtml?familyId=519&tfsection=products&templateId=1

Particularily the TAS5100A and accociated parts.
I don't think it is exactly what you are looking for, but it is somewhat related and you might find the application notes of interest. Enjoy!

 

[audio_cf]

I havent built this one but It got a decent review in High Fidelity.

http://listen.to/audioexperiment

 

[chr]

can someone point me in the right direction? So far all I can find are switching power supplies, but no class D output projects.
Boards, schematics, kits, plans, anything would be appreciated.

I suggest you take a look at Intersil (before Harris) 4080-series of bridge drivers. Harris used to have a fairly complete application note on the web.

Christer

 

[dimitri]

links and info

please visit http://www.classd.org/ for addirional links and info

 

[Pjotr]

http://www.puredigitalaudio.org/digitalamplifiers/index.shtml
http://www.tripath.com/

 

[peranders]

I have a good eye for IcePower but unfortunatly they don't sell their excellent modules to private persons. I wonder why? Maybe their OEM customers have to drop their high prices? A simple IcePower amp costs 3000 USD or more. The modules costs I think 100-200 USD!

 

[Pjotr]

Hi peranders,

Check out tripath, they have really good evaluation boards. I've experimented with them and they sound really good. But beware, these generate a lot of EMI you have to tackle, but that holds for all class D amps

Peter

 

[Rarkov]

Steer clear of ZETEX!!!
I built that 100W amp...Only to find that the inductor doesn't exist! You can order the 1000 version of the inductor but I think the minimum order came to over a grand!

You could wind your own, but I would suggest Tirapth's Class T. I have never heard a bad word against them and will soon be using my chips! They are cheap for what they are too...About £30.

Have fun,
Gaz