Class D beginner, where to start?

Bricolo · 22nd June 2004, 09:46 PM

Hi all,

I'd like to make a PA amp fir a friend, and class D amps look nice for that. Not very expensive, small size, small heatsinks.

But I've never worked with class D, where should I start?

Thanks
Alex

Bricolo · 23rd June 2004, 10:58 AM

no one?

Pafi · 23rd June 2004, 12:27 PM

Hi!

You should try something simple first! Self-oscillating topology with complementary MOSFET output would be fine.

Bricolo · 23rd June 2004, 12:37 PM

I was more thinking about starting with the theory

How does it work, what topologies exist (the advantages and drawbacks of each), how to build one (which chips?)

Some kind of tutorial.

I've browsed some manufacturers websites, but didn't find much.
Linear: found ,othing
National: has 1 class D amp
Onsemi: nothing above 1W
TI: nothing above 20W

peranders · 23rd June 2004, 12:54 PM

Kolla Harris/Intersil, possible also IR.

Bricolo · 23rd June 2004, 01:13 PM

I must be blind, I found nothing on theyr websites (and don't know what kolla is)

Pafi · 23rd June 2004, 01:29 PM

There were posted many links recently.

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

And a "book":
Title: High Efficiency Audio Power Amplifiers; design and practical use
Author: Ronan van der Zee
ISBN: 90-36512875
(I loaded it down from intrnet, but don't know where.)

Devices:
philips (TDA8920 2*80W PWM amp IC)
www.tripath.com (PWM controllers+drivers up to ~2kW)
www.intersil.com (drivers)
www.irf.com (drivers+MOSFETs)
www.advancedpower.com (MOSFETs)

etc...

peranders · 23rd June 2004, 01:34 PM

Quote:

Originally posted by Bricolo
I must be blind, I found nothing on theyr websites (and don't know what kolla is)

Kolla, sorry a swedish word.... = check

kolla = kollationera = collate

dmfraser · 23rd June 2004, 05:44 PM

If you're a beginner, first build an amp someone else designed. There are too many heart breaks in making the first amp you ever build one that you try to design. There are several good schematics available at www.schematicsforfree.mattsoft.net in the audio circuits section.

Bricolo · 23rd June 2004, 06:38 PM

the "audio schematics and manuals" li,k doesn't work

22nd June 2004, 09:46 PM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Class D beginner, where to start? Hi all, I'd like to make a PA amp fir a friend, and class D amps look nice for that. Not very expensive, small size, small heatsinks. But I've never worked with class D, where should I start? Thanks Alex

23rd June 2004, 12:54 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Kolla Harris/Intersil, possible also IR. __________________ /Per-Anders (my first name) or P-A as my friends call me

23rd June 2004, 05:44 PM	#9
dmfraser diyAudio Member Join Date: Dec 2003 Location: Orange County, CA	Class D amps If you're a beginner, first build an amp someone else designed. There are too many heart breaks in making the first amp you ever build one that you try to design. There are several good schematics available at www.schematicsforfree.mattsoft.net in the audio circuits section. __________________ Dan Fraser

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23rd June 2004, 10:58 AM	#2
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	no one?

23rd June 2004, 12:27 PM	#3
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	Hi! You should try something simple first! Self-oscillating topology with complementary MOSFET output would be fine.

23rd June 2004, 12:37 PM	#4
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	I was more thinking about starting with the theory How does it work, what topologies exist (the advantages and drawbacks of each), how to build one (which chips?) Some kind of tutorial. I've browsed some manufacturers websites, but didn't find much. Linear: found ,othing National: has 1 class D amp Onsemi: nothing above 1W TI: nothing above 20W

23rd June 2004, 01:13 PM	#6
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	I must be blind, I found nothing on theyr websites (and don't know what kolla is)

23rd June 2004, 01:29 PM	#7
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	There were posted many links recently. Theory: http://www.irf.com/product-info/audi...sdtutorial.pdf And a "book": Title: High Efficiency Audio Power Amplifiers; design and practical use Author: Ronan van der Zee ISBN: 90-36512875 (I loaded it down from intrnet, but don't know where.) Devices: philips (TDA8920 2*80W PWM amp IC) www.tripath.com (PWM controllers+drivers up to ~2kW) www.intersil.com (drivers) www.irf.com (drivers+MOSFETs) www.advancedpower.com (MOSFETs) etc...

23rd June 2004, 06:38 PM	#10
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	the "audio schematics and manuals" li,k doesn't work

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