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Old 18th January 2009, 09:23 PM   #11
Stee is offline Stee  Italy
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Default Thanks Symon

Thanks Beto
what say your simulator about performance?
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Old 18th January 2009, 11:26 PM   #12
Beto is offline Beto  Brazil
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Quote:
Originally posted by Beto
In the original project could not a good result
modified some parts in the scheme to operate the simulator see the components changed:
R103 and R113 = 47k
R115 connecting a capacitor of 220uf to the ground.
R127 = 2k
Vr103 = 1k
R125 = 1k
q107 put capacitor 22pf of B / C.
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Old 18th January 2009, 11:26 PM   #13
Beto is offline Beto  Brazil
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Stee the simulator seemed ok but I want good opinion of other friends of the forum here because the simulation was done with some changes and to make sure the quality of the amplifier will have to mount the project.
simulation found in the high THD.


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Old 19th January 2009, 05:42 PM   #14
Stee is offline Stee  Italy
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Default ultra very good

probably Q10 AND Q12 need resistor on collectors
like modern CFP

can you post the PCB
that I can order on ebay?
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Old 19th January 2009, 07:54 PM   #15
Beto is offline Beto  Brazil
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STEE the design of the card did not because I am not very good at drawing card. the design and simple to assemble a 4,256 points in placaProtoboard Islands 10x30cm.

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Old 19th January 2009, 08:10 PM   #16
Stee is offline Stee  Italy
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Default hi hi

nice!
I believed that the same simulator generate design...

what do you think about position of resistors 20/21?
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Old 19th January 2009, 08:39 PM   #17
Beto is offline Beto  Brazil
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R20 and R21 in the emitter because the problems in the simulation showed bias when in ultilizado collector.
may be some bug in the simulator and not 100%.
Mounting the project in practice show the reality of the project
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Old 19th January 2009, 09:36 PM   #18
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Quote:
Originally posted by Beto


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Beto, your schematic looks off. Look at Q13's base. Shouldn't this be connected at Q8's emitter?

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Old 19th January 2009, 10:04 PM   #19
Beto is offline Beto  Brazil
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Ok Keantoken the right and in turn the basis Q8 emitter.
you are correct. thanks
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Old 19th January 2009, 10:06 PM   #20
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You're welcome.

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