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-   -   DIAMOND BUFFER WITH CFP PAIR (http://www.diyaudio.com/forums/solid-state/228634-diamond-buffer-cfp-pair.html)

Stee 25th January 2013 06:38 PM

DIAMOND BUFFER WITH CFP PAIR
 
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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

not a simple triple stage emitter follower PP
 
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the cell CFP has a total internal feedback
I've never used a simulator to calculate the distortion:D

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 26th January 2013 06:41 PM

Better to start simple and add complexity
 
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of course :):):)

Stee 26th January 2013 07:56 PM

AS LTP DRIVER?
 
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:D

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

Back to the drawing board
 
3 Attachment(s)
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


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