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Old 9th September 2010, 09:04 PM   #1
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Default Class A Amplifier using IGBTs

Today i built a stereo class A amplifier using FGA25N120 IGBTs, all it took was three resistors and a capacitor.


Heres a video: YouTube - IGBT Class A Amplifier

This is the first solid state class A amp i ever built.
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Old 10th September 2010, 03:36 AM   #2
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Location: Bangalore, India
Schematic? Did you listen to it and what are your impressions?
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Old 10th September 2010, 06:09 AM   #3
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The circuit is very similar to the pass zen lite circuit.

The sound is decent, can't really tell until i've gotten rid of the hum.
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Old 10th September 2010, 12:55 PM   #4
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This is the schematic of my amp:
Click the image to open in full size.
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Old 10th September 2010, 04:25 PM   #5
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An update on my amp:
YouTube - Class A amp bias and matching
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Old 10th September 2010, 11:10 PM   #6
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I have power amp. schematic use IGBT but I do not know how it work.
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Old 11th September 2010, 12:51 PM   #7
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I rebuilt the amp today:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 12th September 2010, 10:06 PM   #8
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I have now replaced the igbts with mosfets, more exactly IRF3205's.

Schemo:
Click the image to open in full size.

It seem to sound better now with mosfets, bias current is around 3.6A per channel with an input voltage of about 14V.
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Old 17th September 2010, 03:17 PM   #9
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Today the new psu caps arrived:
Click the image to open in full size.
Click the image to open in full size.

The amp now barely hums at all.
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