Class A Amplifier using IGBTs

Tekko · 9th September 2010, 08:04 PM

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.

Samuel Jayaraj · 10th September 2010, 02:36 AM

Schematic? Did you listen to it and what are your impressions?

Tekko · 10th September 2010, 05:09 AM

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.

Tekko · 10th September 2010, 11:55 AM

This is the schematic of my amp:

Tekko · 10th September 2010, 03:25 PM

An update on my amp:
YouTube - Class A amp bias and matching

theerasak khan · 10th September 2010, 10:10 PM

I have power amp. schematic use IGBT but I do not know how it work.

Tekko · 11th September 2010, 11:51 AM

I rebuilt the amp today:

Tekko · 12th September 2010, 09:06 PM

I have now replaced the igbts with mosfets, more exactly IRF3205's.

Schemo:

It seem to sound better now with mosfets, bias current is around 3.6A per channel with an input voltage of about 14V.

Tekko · 17th September 2010, 02:17 PM

Today the new psu caps arrived:

The amp now barely hums at all.

9th September 2010, 08:04 PM	#1
Tekko diyAudio Member Join Date: Jan 2005	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.

10th September 2010, 02:36 AM	#2
Samuel Jayaraj diyAudio Member Join Date: May 2001 Location: Bangalore, India	Schematic? Did you listen to it and what are your impressions? __________________ Sam

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10th September 2010, 05:09 AM	#3
Tekko diyAudio Member Join Date: Jan 2005	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.

10th September 2010, 11:55 AM	#4
Tekko diyAudio Member Join Date: Jan 2005	This is the schematic of my amp:

10th September 2010, 03:25 PM	#5
Tekko diyAudio Member Join Date: Jan 2005	An update on my amp: YouTube - Class A amp bias and matching

11th September 2010, 11:51 AM	#7
Tekko diyAudio Member Join Date: Jan 2005	I rebuilt the amp today:

12th September 2010, 09:06 PM	#8
Tekko diyAudio Member Join Date: Jan 2005	I have now replaced the igbts with mosfets, more exactly IRF3205's. Schemo: It seem to sound better now with mosfets, bias current is around 3.6A per channel with an input voltage of about 14V.

17th September 2010, 02:17 PM	#9
Tekko diyAudio Member Join Date: Jan 2005	Today the new psu caps arrived: The amp now barely hums at all.