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Class D Switching Power Amplifiers and Power D/A conversion

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Old 23rd December 2012, 09:07 PM   #1
cyto is offline cyto  United States
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Default Recommendation needed

Hi All,
I used to be an electronics tech in the 70s but got out to work in the medical field. I still like to build a little but mostly tinker with my store bought electronics.

I want to build two class d amps to use as monoblocks, about 100w each. They will be used to drive Klipsch Heresy speakers.

I have done a lot of searching (here and elsewhere) but I am having trouble finding a schematic to start from. I don't want to get a kit and put it together. I want to build from a schematic. I may or may not build the power supplies.

Does anyone here have a recommendation?

Advise is greatly appreciated

Thanks

David
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Old 24th December 2012, 01:09 AM   #2
DUG is offline DUG  Canada
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One method if you can make a circuit board:

Go to Digi-key.com

Search for amplifiers, in stock

Then select linear-amplifiers-audio

Then scroll down what power level you want to try and get the data sheet...There are usually schematics within the data sheets.

Lots of choices.

Have fun
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Old 24th December 2012, 01:13 AM   #3
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Depending on your experience with switching amplifiers/power supplies I wouldn't recommend a class d amp.

They are very fussy about layout and decoupling.

However IR give applications and pcb layouts so this should minimise any risk of none working pcb's. They do from 50 watts up to 1.7Kwatt amplifiers in class d.

I have been through the cycle of designing my own class d amp and did a couple of pcb revisions before I got it right. So taking a working system from IR is the way to go.
International Rectifier Home Page - Flash Detection
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Old 24th December 2012, 01:30 AM   #4
cyto is offline cyto  United States
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Thanks I will check both out. Nigel I really don't have much experience with class d, the circuits just look a little simpler to build.

I did look a little closer at the "honey badger" here at DIY. It looks interesting and of course is a/b. I guess I could build it a two mono blocks.
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Old 28th December 2012, 04:08 AM   #5
AC439 is offline AC439  United States
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Quote:
Originally Posted by cyto View Post
Hi All,
I used to be an electronics tech in the 70s but got out to work in the medical field. I still like to build a little but mostly tinker with my store bought electronics.

I want to build two class d amps to use as monoblocks, about 100w each. They will be used to drive Klipsch Heresy speakers.

I have done a lot of searching (here and elsewhere) but I am having trouble finding a schematic to start from. I don't want to get a kit and put it together. I want to build from a schematic. I may or may not build the power supplies.

Does anyone here have a recommendation?

Advise is greatly appreciated

Thanks

David
David....I too have a similar background and now in medical field as well. In this field, we don't have exact science but we perform "practice". I would say go for it and build the amp from scratch, experiment and gain experience from it, then share it here.

I prefer to build from schematic than from a kit. I like to source my parts from my parts bins and putting them together. If I use a kit, I don't feel the final product is 100% my work.

regards.
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Old 30th December 2012, 08:19 PM   #6
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I would probably not dare to build a Class D amp. However, having successfully (more or less) built a few simple kits, I wondered: has anyone done a point to point wired
Class D? I realize there is an "art" to correct layout for a Class D, but perhaps those same issues are present (or less) in PTP wiring. 21st century chip meets mid-20th century hand-wiring. Use old school parts. No law says your diodes or capacitors have to be the size of an ant's turd
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Old 30th December 2012, 08:53 PM   #7
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Quote:
Originally Posted by cyto View Post
Hi All,
I used to be an electronics tech in the 70s but got out to work in the medical field. I still like to build a little but mostly tinker with my store bought electronics.

I want to build two class d amps to use as monoblocks, about 100w each. They will be used to drive Klipsch Heresy speakers.

I have done a lot of searching (here and elsewhere) but I am having trouble finding a schematic to start from. I don't want to get a kit and put it together. I want to build from a schematic. I may or may not build the power supplies.

Does anyone here have a recommendation?

Advise is greatly appreciated

Thanks

David
Have a look at International Rectifier Home Page - Flash Detection there are some complete class d projects including pcb.

I was silly enough to start from an app note and built my own pcb and went through a couple of revisions of pcb before I got it right.
The irs2092 is touchy about layout and decoupling.
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