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Old 14th February 2013, 03:56 AM   #1
Stee is offline Stee  Italy
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Default Amarna Sun - a new amplifier design

here is how it evolves the design of an amplifier which has the same architecture as the stage voltage and the current too
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File Type: jpg AMARNA 2 LAYOUT.jpg (116.4 KB, 529 views)
File Type: png AMARNA 2.PNG (30.4 KB, 532 views)
File Type: jpg AMARNA SUN LOGO.jpg (32.3 KB, 515 views)
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Last edited by Stee; 14th February 2013 at 05:05 AM.
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Old 14th February 2013, 04:46 AM   #2
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So the current mirror resistors carry all but 1.2V of the supply.

What is the supply for these stages?
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Old 14th February 2013, 05:08 AM   #3
Stee is offline Stee  Italy
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Default Sorry need two resistors

on Current Mirror
supply is 24V (dual)
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Old 14th February 2013, 05:11 AM   #4
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Still don't get the current mirror part.

I'll have to look at it some more.
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Old 14th February 2013, 05:23 AM   #5
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Nope, I don't think that this current mirror will give you gain.

Take the top portion.

If the base of the transistor close to the "VAS" label starts to go negative, the emitter starts to go negative.

Then the base of the transistor on the left goes negative and tries to pull more current (in a positive direction) from the connection that is trying to pull the "VAS" transistor negative...with gain.

It looks like a current source that is supposed to be independent of drive...the added resistors.

Please explain how this is supposed to work.

I'm baffled.

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Old 14th February 2013, 05:32 AM   #6
Stee is offline Stee  Italy
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Default because there is an example

see there pictures
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File Type: png AMARNA 3.PNG (112.2 KB, 312 views)
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Old 14th February 2013, 06:55 AM   #7
Stee is offline Stee  Italy
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Default inverting VAS

in order to correct the output signal is necessary to have the return phase inverted
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Last edited by Stee; 14th February 2013 at 06:59 AM.
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Old 14th February 2013, 12:01 PM   #8
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Sorry, I will have to try the cct...

I am concerned about the global feedback.

See jpg.

It looks to me that it would latch up.

Have you built one of these yet?
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Old 14th February 2013, 02:53 PM   #9
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Default yes it is wrong

global feedback it's no possible
because double denied stages
make again in-phase signal

never build, I'm waiting for PCB

look the EF Output Stage option
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File Type: png INVERTING VAS.PNG (52.9 KB, 84 views)
File Type: png AMARNA 3.PNG (105.6 KB, 121 views)
File Type: gif optimum.GIF (14.4 KB, 140 views)
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Old 15th February 2013, 02:07 AM   #10
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Please review.

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