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
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
Hi!
You should try something simple first! Self-oscillating topology with complementary MOSFET output would be fine.
You should try something simple first! Self-oscillating topology with complementary MOSFET output would be fine.
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
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
There were posted many links recently.
Theory:
http://www.irf.com/product-info/audio/classdtutorial.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...
Theory:
http://www.irf.com/product-info/audio/classdtutorial.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...
Bricolo said: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

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.
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.
but you're right, I'll copy an existing design
I'm sure there are some well known, proven designs somewhere. I just have to find them 😀
I'm sure there are some well known, proven designs somewhere. I just have to find them 😀
schematicsforfree.mattsoft.net
It looks like an update did not load right.
Don't click on the audio section. There has been some restructuring.
Click on the link "File Index" near the top of the home page.
It looks like an update did not load right.
Don't click on the audio section. There has been some restructuring.
Click on the link "File Index" near the top of the home page.
Bricolo said:I've browsed some manufacturers websites, but didn't find much.
National: has 1 class D amp
Did you find this one?
http://www.national.com/pf/LM/LM4652.html
I suppose you need more power... no?
Take all the energy you have, and self control, and try to read entire forum
I did that twice, only Solid State, now trying to read all Chip amps too.
I think, you will colect all the needed informs want to have.
There's a lot of threads that will help you, put them in condition to be readed off line in the Internet Explorer ,and others too, and take notes..... i think will be very good, and will answer more than 80 percent your needs.
regards,
Carlos
I did that twice, only Solid State, now trying to read all Chip amps too.
I think, you will colect all the needed informs want to have.
There's a lot of threads that will help you, put them in condition to be readed off line in the Internet Explorer ,and others too, and take notes..... i think will be very good, and will answer more than 80 percent your needs.
regards,
Carlos
Carlos,
I ofen use the search function a lot, when I need something.
Bu in some cases (like here) the limitations of the search engine prevent it from working. You can't ask for a <3 letter word, so "class d" doesn't work 🙁
or I don't know how to use it... 🙁
I ofen use the search function a lot, when I need something.
Bu in some cases (like here) the limitations of the search engine prevent it from working. You can't ask for a <3 letter word, so "class d" doesn't work 🙁
or I don't know how to use it... 🙁
OK!, Va benne Bricolo, all right Bricolo
Keep on trying.... i thing our friends will run to help you.
US is waking up now.... hundreds of americans will be interested to help you.... wait some ours.
regards,
Carlos
Keep on trying.... i thing our friends will run to help you.
US is waking up now.... hundreds of americans will be interested to help you.... wait some ours.
regards,
Carlos
I think UcD is looking pretty good as a front-runner DIY favorite.
Sometimes I open several pages in new windows and break my Internet connection for a while if I am trying to catch up on a thread. 🙂
destroyer X wrote: There's a lot of threads that will help you, put them in condition to be readed off line in the Internet Explorer ,and others too, and take notes..... i think will be very good, and will answer more than 80 percent your needs.
Sometimes I open several pages in new windows and break my Internet connection for a while if I am trying to catch up on a thread. 🙂
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