50watt class-b amp mx50v6

ljm_ljm · 12th November 2009, 09:12 AM

this is my design for the class b 50W8R analog amplifier.
I named : MX50
Will soon be doing testing。
SCH is for your reference only

ljm_ljm · 13th November 2009, 05:41 AM

This design of class b amplifier base on douglas no defact amp.through the test result.this amp Is not steady.later the process of revision continued at test. i added a delay compensation in the input stage.

ljm_ljm · 26th November 2009, 02:28 PM

Testing

ljm_ljm · 27th November 2009, 03:43 PM

Test for output power 10w
fft test

nyqxmfj · 28th November 2009, 02:21 AM

So Great!
I'll buy it! Can you support "Taobao.com" or PayPal?

nyqxmfj · 28th November 2009, 02:32 AM

How many volts voltage support?
Can AC28*2?

ljm_ljm · 28th November 2009, 04:19 AM

Quote:

Originally Posted by nyqxmfj

How many volts voltage support?
Can AC28*2?

voltage AC 30*2
DC < + - 45V

welcome send me an emial if you have any questions .

ljm_ljm@126.com

nyqxmfj · 28th November 2009, 05:20 PM

Quote:

Originally Posted by ljm_ljm

voltage AC 30*2
DC < + - 45V

welcome send me an emial if you have any questions .

ljm_ljm@126.com

Thanks for your help very very much!
I'll buy it.
I have a "Taobao.com" account.Can I buy it on "Taobao.com"?
Please E-Mail to me 'Taobao' Links for your amp 'MX50' Version 6.0
Thank you.

wrenchone · 28th November 2009, 11:45 PM

Not to seem like a spoilsport, but this thread should really be over in the solid state forum.This is a big amp, and this forum is for little preamps....

wahab · 29th November 2009, 12:30 AM

it s seems there s a flaw in the voltage amplifier 's current generator....
it must be biaised separately, and not using the current generator of
the differential stage...
connect R6 to ground and give it a value of 15K, and connect two serial
diode between the base of Q4 to positive supply...the current will be about
6 mA through this transistor..
Q4 and Q12 are not correctly rated, they won t stand the power..
use BD139/140 instead, and you can use these transistor to replace
Q5 and Q9 , it will be better than the plastic used BC639/640....
the output stage is a compound pair, and it is more prone to
oscillations than a emitter follower configuration, not mentionning
that the latter has better distorsion at low level and is easier
to stabilize...
for the rest, this schematic should sound fine...

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13th November 2009, 05:41 AM	#2
ljm_ljm diyAudio Member Join Date: Sep 2006	This design of class b amplifier base on douglas no defact amp.through the test result.this amp Is not steady.later the process of revision continued at test. i added a delay compensation in the input stage.

28th November 2009, 02:21 AM	#5
nyqxmfj diyAudio Member Join Date: Nov 2009	So Great! I'll buy it! Can you support "Taobao.com" or PayPal?

28th November 2009, 02:32 AM	#6
nyqxmfj diyAudio Member Join Date: Nov 2009	How many volts voltage support? Can AC28*2?

28th November 2009, 11:45 PM	#9
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Not to seem like a spoilsport, but this thread should really be over in the solid state forum.This is a big amp, and this forum is for little preamps....

29th November 2009, 12:30 AM	#10
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	it s seems there s a flaw in the voltage amplifier 's current generator.... it must be biaised separately, and not using the current generator of the differential stage... connect R6 to ground and give it a value of 15K, and connect two serial diode between the base of Q4 to positive supply...the current will be about 6 mA through this transistor.. Q4 and Q12 are not correctly rated, they won t stand the power.. use BD139/140 instead, and you can use these transistor to replace Q5 and Q9 , it will be better than the plastic used BC639/640.... the output stage is a compound pair, and it is more prone to oscillations than a emitter follower configuration, not mentionning that the latter has better distorsion at low level and is easier to stabilize... for the rest, this schematic should sound fine...

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