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Old 20th October 2006, 05:57 PM   #1
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Location: serbia, zajecar
Default New SE follower design


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: 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...

Attached Files
File Type: pdf k-10se _01.pdf (22.8 KB, 343 views)
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Old 20th October 2006, 06:53 PM   #2
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It looks nice enough to me.

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Old 20th October 2006, 07:16 PM   #3
Fuling is offline Fuling  Sweden
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Location: Sweden (Mora)
The input buffer seems like a good idea.
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Old 21st October 2006, 04:50 PM   #4
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Location: serbia, zajecar
Should input transistors be thermaly coupled?

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

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