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Old 8th July 2012, 06:22 PM   #1
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Default IRFP450 for output stage

Hi,
can IRFP450 good for Class A amplification, its transfer curve seems very parallel and linear, any design for it ? regards
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Old 8th July 2012, 07:05 PM   #2
MarianB is offline MarianB  Romania
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Any MOSFET output amplifier should work as long as you keep in mind it's limits.
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Old 8th July 2012, 08:55 PM   #3
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I mean SQ, sound Quality
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Old 9th July 2012, 05:00 AM   #4
MarianB is offline MarianB  Romania
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Well then, if you think about the fact that many people say that vertical mosfets are more of an industrial devices than audio ones than you might think there is no Hi-fi audio power amplifier for them, but that i think is more of a subjectively opinion.
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Old 9th July 2012, 11:11 PM   #5
CBS240 is offline CBS240  United States
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Many people say they are not for use in Hi-Fi, I disagree. It is all in how they are used. I believe they are exactly the type of device to use when driving a highly reactive load such as a speaker, motor, transformer, inductor, ect. However, if one uses them as if they are a BJT, then I believe they will be dis-pleased with the result. Of course they are not BJTs and work on an entirely different principle. These devices are intended to be used for switching purposes, so some special effort must be taken to use them as analog amplifiers. They are simpler to use for quality class A operation due to the Gm characteristics, Mr. Pass has several examples, search the Pass forum. Class AB is a different story.

You should choose a device based on the transconductance you require.
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