DIAMOND BUFFER WITH CFP PAIR

Stee · 25th January 2013, 06:38 PM

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 · 25th January 2013, 07:20 PM

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 · 25th January 2013, 10:13 PM

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 · 25th January 2013, 10:26 PM

Hi,

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

rgds, sreten.

AudioLapDance · 25th January 2013, 10:45 PM

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 · 06:56 PM

of course

Stee · 08:14 PM

sreten · 26th January 2013, 08:36 PM

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 · 26th January 2013, 09:12 PM

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 · 27th January 2013, 08:46 AM

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

25th January 2013, 10:26 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Your enthusiasm is admirable. Your originality dismal. To be brutally honest a generally too simple attitude. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

26th January 2013, 08:36 PM	#8
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, If you think I'm being a poop fair enough. If you think mains toroids are designed for audio, think again. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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25th January 2013, 07:20 PM	#2
BachAudioDK diyAudio Member Join Date: Dec 2007	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

25th January 2013, 10:45 PM	#5
AudioLapDance diyAudio Member Join Date: Jun 2003 Location: Hamilton, was Ottawa (Canada)	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.

26th January 2013, 09:12 PM	#9
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	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.