Class D Design Issues

Variac · 28th November 2006, 10:41 PM

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

I can't stand to see and empty thread

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

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?

28th November 2006, 10:41 PM	#1
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA San José, Costa Rica	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. __________________ "The geek shall inherit the earth" 2018 Burning Amp is Sept 30 in S.F. Thread here on diyAudio: http://www.diyaudio.com/forums/clubs...francisco.html

13th December 2006, 05:26 AM	#2
raintalk diyAudio Member Join Date: Jul 2004 Location: Seattle USA	First Class-d amp I can't stand to see and empty thread 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

20th January 2007, 06:21 PM	#4
Genomerics Account Disabled Join Date: Oct 2004	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

19th April 2007, 03:51 PM	#5
Groman diyAudio Member Join Date: Apr 2007	Do you know any ebook or web page of class D amplifier for beginners? __________________ Groman

3rd July 2007, 03:25 PM	#7
TJNII diyAudio Member Join Date: Jul 2007	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.) __________________ This space intentionally left blank


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3rd January 2007, 09:56 PM	#3
odnaizutra diyAudio Member Join Date: Jan 2007	Do you think a full bridge,single supply 130v ,4irf260,2 ir2010,lm319 and 4060 giving 228khz a good begining?

23rd April 2007, 09:44 PM	#6
bknauss diyAudio Member Join Date: Jul 2002 Location: Gaithersburg, MD	http://www.irf.com/product-info/audi...sdtutorial.pdf

3rd July 2007, 03:49 PM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, modules and more.

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