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-   -   Class D Design Issues (http://www.diyaudio.com/forums/class-d/91219-class-d-design-issues.html)

Variac 28th November 2006 10:41 PM

Class D Design Issues
 
This is a thread for the discussion of the design of class D amps, not discussion of kits or modifying existing amps.

raintalk 13th December 2006 05:26 AM

First Class-d amp
 
I can't stand to see and empty thread :umbrella:

I think this is the first Class-d amp: US Patent 03011025 in 1961 by Herbert W. Sullivan
A tube amp, and the parts look to still be available today.

Go to: http://patft.uspto.gov/netahtml/PTO/search-bool.html
And search all fields for 03011025
Select the date: 1790 to present

odnaizutra 3rd January 2007 09:56 PM

Do you think a full bridge,single supply 130v ,4irf260,2 ir2010,lm319 and 4060 giving 228khz a good begining?

Genomerics 20th January 2007 06:21 PM

My Boring Website
 
Since this thread is about Class D design issues......

The Ramblings of a Mind Gone Wrong

A journey into the ins and outs of what Class D might be about from the perspective of someone who is trying to work it out.

DNA

Groman 19th April 2007 03:51 PM

Do you know any ebook or web page of class D amplifier for beginners?

bknauss 23rd April 2007 09:44 PM

http://www.irf.com/product-info/audi...sdtutorial.pdf

TJNII 3rd July 2007 03:25 PM

It's tough. I've been working on one based off a PWM design for a year now and it's kicking my butt. I've got a prototype in the other room that plays, but doesn't sound too good and has a problem with ultra-low frequencies on the output. One of the few amp designs you'll come across that pass the signal through nand gates and optocouplers. On the upside, I think I have designed a successfull output stage for it. (Gotta take pride in the small victories.)

richie00boy 3rd July 2007 03:49 PM

There is already a thread discussing the design, classd4sure started it a year or two ago, full of useful info. Bit biased towards UcD though I believe.

Electrone 3rd July 2007 05:38 PM

Quote:

Originally posted by TJNII
has a problem with ultra-low frequencies on the output.
Check the power supply for the high side switch. It may be dropping too low if it is normally refreshed by bootstrapping.

BWRX 4th July 2007 12:02 AM

Quote:

Originally posted by TJNII
It's tough. I've been working on one based off a PWM design for a year now and it's kicking my butt.
Hi TJNII. Care to share more about your design with the rest of us?


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