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Old 15th November 2004, 03:14 PM   #1
freedom is offline freedom  Denmark
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Question Classification Mess Up

Dear All.

Hope you can help me out here.

At University of Aalborg numerous studentgroups are building class AB amps. Most of us need to explain the other classes commonly used for audio.

Now, according to posts and articles in this forum class G is the class where 2 or more sets of output transistors are placed "on top of each other" with different levels of DC-voltage

Class H is 1 set of output transistors (fx. 5 NPN and 5 PNP - could be any number) but here the supply voltage is raised as needed.

It happens so that i agree with the above mentioned classification. Along other brands, QSC-audio agrees with me. However this homepage and at least one book containing amplifier theory (havenīt recieved author and title yet but will post it) states otherwise.

In general: What do you think is Class G and what is Class H?

Sorry if this topic has been discussed before - i havenīt been able to find it.

Thanks for your time

Hans-Henning / Denmark
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Old 15th November 2004, 04:08 PM   #2
Mr Evil is offline Mr Evil  United Kingdom
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I agree with the definitions in the link. Class G switches between two or more supply voltages to keep power dissipation in the output devices at a minimum. Class H is the same except it varies the supply voltage smoothly. What you describe is a variation of class G where the second pair of output transistors handles the higher rails.

You find some disagreement over the exact definition because they aren't official classifications.
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Old 15th November 2004, 04:32 PM   #3
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