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Old 8th June 2004, 12:12 PM   #1
nag1_uk is offline nag1_uk  United Kingdom
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Question Class G/H

Hi all,
I have just completed my form for my 3rd year project. I am to make either a class G or H audio amp ( my own choice).
I read up on what the terms mean and they both sounded interesting.
Has anyone got any tips on what to look out for when designing this amp. I think the Class H looks a better design that modulates the voltage rails so I would really like to takle that problem

I have buit a few amps in the past, but not designed on as yet so really looking forward to it.

Thanks for any info

Mike Cole
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Old 8th June 2004, 04:47 PM   #2
subwo1 is offline subwo1  United States
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It is an interesting but challenging project. Have fun.
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Old 8th June 2004, 08:03 PM   #3
Did it Himself
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I think Doug Self published a class-g design in Electronics World a few years ago.
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Old 8th June 2004, 09:06 PM   #4
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The 1977 Sano patent nr. 4,115,739 could be of interest.

Regards
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Old 8th June 2004, 09:07 PM   #5
Steven is offline Steven  Netherlands
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Class H in the easy way: http://www.semiconductors.philips.co...TDA1560Q_4.pdf

Steven
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Old 9th June 2004, 02:23 AM   #6
thanh is offline thanh  Viet Nam
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Steven! What's about discrete class H?
What is the difference between class AB and class H?
Who have just succeeded in building a class H amp?
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Old 9th June 2004, 08:24 AM   #7
nag1_uk is offline nag1_uk  United Kingdom
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Quote:
Originally posted by rtirion
The 1977 Sano patent nr. 4,115,739 could be of interest.

Regards

How do I find any thing on what you have suggested?


Thanks for all info.

I am interested in making a descrete unit but thanks for the linkl to the IC.

I have a while before I have to buile this yet so I will keep looking for info for now.

Thanks to all

Mike
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Old 9th June 2004, 03:32 PM   #8
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You can find the patent at the US patent office

http://www.uspto.gov/

Use Patent Search | Patent Number Search | fill in 4,115,739

You will see an abstract. Click on Images to see the actual page.
You will need a TIFF viewer.

Hope this helps

Regards
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Old 9th June 2004, 03:35 PM   #9
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Default Tiff viewer plugin

Tiff viewer plugin for IE6 can be found here

http://www.alternatiff.com/

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Old 9th June 2004, 05:23 PM   #10
sam9 is offline sam9  United States
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BTW, the Self class D is available in kit form. Obviously that's cheating for a 3rd year project.

Since one of the reasons for the class is to reduce the physical size of the amp, one of the key elements is getting your hands on an appropiate transformer such as a 35-18-0-18-35. Obviously you could use two but that kind of negates some of the objectives. A true DIY fanatic would wind his own, of course.
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