New SE follower design

bogdan_borko · 20th October 2006, 05:57 PM

Hi!

The schematic I attached is a my version of class A, single ended ,mosfet power follower. I made the prototype and this is the most "neutral" sounding amplifier I heard so far! (this may be subjectivism).
I have no equipment to measure thd but when simulating, this design gives 20 to 30dB better thd figures then classic type power follower.
I wanted to make se class A follower that could be driven from a simple 6DJ8 common cathode voltage amplifier.
Simulation results and other data:
1.thd 2nd. 0.005% at full power
thd 3rd. 0.001% at full power
thd 5th. 0.007% at full power
2.When driven with high output impedance voltage stage(50K), bandwidth is(15Hz - 100KHz(+/-0.5dB))
3.Input stage bias 10.8mA
4.Out stage bias 2.2A per mosfet
5.Power 30W at 4Ohm in pure class A(Input voltage 18V)

So, wath do you think, any suggestions before I start to make PCB?

It would be nice if NP could comment...

Cheers!

Nelson Pass · 20th October 2006, 06:53 PM

It looks nice enough to me.

Fuling · 20th October 2006, 07:16 PM

The input buffer seems like a good idea.

bogdan_borko · 21st October 2006, 04:50 PM

Should input transistors be thermaly coupled?

I`ll send PCB file when I do it...

thanks!

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20th October 2006, 06:53 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	It looks nice enough to me.

20th October 2006, 07:16 PM	#3
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	The input buffer seems like a good idea.

21st October 2006, 04:50 PM	#4
bogdan_borko diyAudio Member Join Date: Nov 2005 Location: serbia, zajecar	Should input transistors be thermaly coupled? I`ll send PCB file when I do it... thanks!