DIAMOND BUFFER WITH CFP PAIR

[Stee]

As you know Complementary Feedback Pair is like a SUPERTRANSISTOR

have a big current gain
therefore ideal for super-buffer (GV = 1)
for transformer amp

 

[BachAudioDK]

Hi,

How is distortion figures compared to the simple triple stage emitter follower PP biased into class A without feedback?

And what about Thermal stability?

Regards
Flemming

 

[Stee]

not a simple triple stage emitter follower PP

the cell CFP has a total internal feedback
I've never used a simulator to calculate the distortion

for the thermal stability can add a bias active in parallel to the trimmer 1K

 

[sreten]

Hi,

Your enthusiasm is admirable. Your originality dismal.
To be brutally honest a generally too simple attitude.

rgds, sreten.

 

[AudioLapDance]

Oh, don't listen to him. He's just being a poop.

Better to start simple and add complexity as you come to understand it than to strip off complexity you don't understand to make it simple!

Cheers,
Jeff

Maybe you should throw it into a simulator.

 

[Stee]

Better to start simple and add complexity

of course

 

[Stee]

AS LTP DRIVER?

 

[sreten]

Hi,

If you think I'm being a poop fair enough.

If you think mains toroids are designed for audio, think again.

rgds, sreten.

 

[jerluwoo]

I did some sims with this buffer and found it to be prone to oscillation and thermal runaway. Couldnt find a way to fix these issues without making it rather more complicated and even then it was a bit dicey. Back to the drawing board I would say.

 

[Stee]

Back to the drawing board

There are two strategies for the thermal drift
promote the effectiveness of bias (eg darlington)
or raise the value of the resistors output

for the oscillation mate better complementary pairs
--> (same hFE as 2SA1186 & C)
then you add capacity on driver base if need