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Old 20th April 2004, 11:54 AM   #1
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Smile Do someone knows how to change the crazy way i wan't?

I never find..... an amplifier that can work class A till the beginning of clipping..... and, when clipping starts the input is reduced around 10 percent and an special new output stage is switched on.

The "special output" with high voltage..... something alike plus and minus 80 volts...and.... the first class A amplifier is switched to AB class automatically when volume is increased or audio input is increased .

It is confused?.... i know that!

I put a schematic, a class A schematic that simulates very well and i will assemble.... but 30 watts in 4 ohms is less than i want.

So, when i reach distortion i want this amplifier to switch to AB... this way the power will increase.....in this moment a reduction in input signal to prevent override.... and same time another output is conected to the 30 watts class A amp (Already switched to AB) and this output have higher voltage on their output transistors....

that's not crazy...... but i already know i am crazy!..... sorry....but a suppose all off us in this forum has some mind disturbance.... some brain diode shorted or something alike.... so..... i think i wellcome to this brotherhood.

Carlos is the Destroyer X, and will put a lot off brazilian schematics to you all improve.
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Old 20th April 2004, 12:02 PM   #2
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Hi D-x Carlos,

You should look for the updated version with two ccs. The version that you posted RV2 is rather difficult to get in good quality it needs to be around 2watt or above. I think it was said that this circuit can not will not work in class ab, I may be wrong here...

Regards,
Chris
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Old 20th April 2004, 12:34 PM   #3
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If I understand correctly then you'd like to build something like a class G amp that runs class A at low levels. You will need a complementary design if you want to do this.
Meyersound uses such an amp with their X10 active studio monitor.

Regards

Charles
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Old 20th April 2004, 02:58 PM   #4
sreten is offline sreten  United Kingdom
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D.Selfs class G amplifier can be configured to
class A with rail switching at class A "clipping".

sreten.
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Old 20th April 2004, 02:59 PM   #5
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Thumbs up Mr Phase Accurate

Thak you by the cooperation and your good compreension related my truncated english.

If you can have the schematics, send me or put it here.

Having not..... no problem... and be happy!

Carlos
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Old 20th April 2004, 03:04 PM   #6
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Smile Answer to Sreten

Thank you Sreten..... if you know where i can find more info. rellated to that kind of amplifiers, please, let me know.

Carlos
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Old 20th April 2004, 03:20 PM   #7
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Quote:
D.Selfs class G amplifier can be configured to class A with rail switching at class A "clipping".
That's a worked-out example for which even PCBs are available! I don't have a scanner unfortunately but maybe soemone else does, who has the respective issue of electronics World.

Regards

Charles
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Old 21st April 2004, 01:47 AM   #8
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Smile It's OK Charles, the Phase Accurate

I will find in the web some infos related to this machine you talking about.
Scanner sometimes is good.... but we can go without it too.
You welcome.
Thanks
Carlos is same as Charles.
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Old 21st April 2004, 03:22 AM   #9
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deslf
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Old 21st April 2004, 03:29 AM   #10
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Or the place that sells the boards
signal transfer uk

Maybe the inner transistors could be biased up to class A. Poke around, This guy has lots of good reading material.
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