More simple class A

jerluwoo · 24th October 2006, 07:55 AM

Starting a new thread for a new circuit. Moderators if you feel this should be merged with "my simple class a approach" please do so.
Here we have the same output stage as before with a basic discrete opamp frontend, split rails, and no coupling capacitor.

ilimzn · 24th October 2006, 08:04 AM

You can omit R2 (replace it with a short)

jerluwoo · 24th October 2006, 08:10 AM

Yes it can be shorted and still work the same. A current mirror would be better hear but this is just a preliminary circuit for concept. Values and all are not final as I am in need of some help with diffrential circuit and frequency compensation.

darkfenriz · 24th October 2006, 10:20 AM

Your C3 looks too high for me.

jerluwoo · 24th October 2006, 12:26 PM

Without C3

jerluwoo · 24th October 2006, 12:28 PM

With C3

Ryssen · 24th October 2006, 02:46 PM

I am not so keen in construktion,but Wouldn´t a more "modern" transistors make the amp work better?

jerluwoo · 24th October 2006, 04:19 PM

Better transistors always will work better. I model with I have on hand to build with for the first "test" circuit. Speaking of which I spent the last couple hours building it. It is only very basic build without "real" ccs's but the sound quality is good. Offset at the output is more than I would like but improvments can be made to lower it easily.

24th October 2006, 02:46 PM	#7
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	I am not so keen in construktion,but Wouldn´t a more "modern" transistors make the amp work better? __________________ Regards Åke

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24th October 2006, 08:04 AM	#2
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	You can omit R2 (replace it with a short)

24th October 2006, 08:10 AM	#3
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	Yes it can be shorted and still work the same. A current mirror would be better hear but this is just a preliminary circuit for concept. Values and all are not final as I am in need of some help with diffrential circuit and frequency compensation.

24th October 2006, 10:20 AM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Your C3 looks too high for me.

24th October 2006, 04:19 PM	#8
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	Better transistors always will work better. I model with I have on hand to build with for the first "test" circuit. Speaking of which I spent the last couple hours building it. It is only very basic build without "real" ccs's but the sound quality is good. Offset at the output is more than I would like but improvments can be made to lower it easily.

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