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Old 26th August 2012, 03:59 PM   #1
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Default Breeze amplifier.

I'm sorry dear audience for the bad English.
As a replacement of the classic triode tube PP amps.
With this task, he successfully managed.
The first model was established 2.5 years ago.
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Old 26th August 2012, 05:38 PM   #2
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It look's there's some balancing adjustment vr's in the i/p stage..the amp does not seem to have a zobel circuit on the o/p end a 10 ohm 5 watt plus a 100nf would do here..
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Old 26th August 2012, 06:11 PM   #3
DUG is offline DUG  Canada
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source follower J-FETdriving
common base BJT driving
emitter follower BJT driving
common source MOS-FET

current source output

with no closed loop feedback (except for DC)

Interesting circuitry

Any distortion tests done?
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Old 26th August 2012, 06:53 PM   #4
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Zobel at the amplifier output is not needed.
It measured the output impedance (without ballast resistor 200 ohms) 600 ohms.
Output current proportional to the input voltage.
All stages except the output operates in class A.

Last edited by Svjatoslav; 26th August 2012 at 07:13 PM.
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Old 26th August 2012, 07:03 PM   #5
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IMD is very close to the harmonic distortion. Fundamental harmonics - 2 and 3, the highest decrease rapidly. Slowly increased with increasing power and range is always falling.
Cf measurement at 5W into 8 ohms in investing.
Design has turned out due to the fact that it was possible to find and pick up really jfet complementary pairs of transistors for low-power amplifier input.
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File Type: jpg Б*ИЗ 5в на 8ом..jpg (27.3 KB, 206 views)
File Type: jpg 2SK246GR, КП103Л пари змен..JPG (75.0 KB, 185 views)

Last edited by Svjatoslav; 26th August 2012 at 07:31 PM.
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Old 27th August 2012, 06:19 AM   #6
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Quote:
Originally Posted by Svjatoslav View Post
As a replacement of the classic triode tube PP amps.
wow, how about the output offset, dcgnfb controlls it?
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Old 27th August 2012, 06:38 AM   #7
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While tube PP that compare, much inferior Breeze by the sound.
This is in my opinion in a preview of all due to its very high output impedance. The second - with high linearity preliminary stages covered by local feedback in Class A at low variable voltage.
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Old 3rd September 2012, 05:43 AM   #8
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Can be chosen a pair of complementary transistors
BF245A-2SJ103GR.
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