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Old 9th February 2013, 05:04 PM   #541
drauns is offline drauns  Indonesia
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Default Dx Super A

uncle carlos MJL4281A can replace the 2SC5200 and MJL4202A to 2SA1943
what are the components that need to be replaced
sorry my bad english language

regards
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Old 9th February 2013, 07:49 PM   #542
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Location: Recife - Brasil Northeast
Default Nothing needed to replace...just avoid 2 ohms loads

No replacement of parts, just put your transistors and be happy.

regards,

Carlos
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Old 9th February 2013, 07:49 PM   #543
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Default Live Brazilian Carnival...for free to you

Here:

YouTube Carnaval - YouTube

Image shows places covered by Youtube Carnival

Carlos
Attached Images
File Type: jpg Places of Youtube Carnival in Brazil.jpg (734.9 KB, 343 views)
File Type: jpg Youtube Brazilian Carnival.jpg (752.2 KB, 303 views)
File Type: jpg My power transistor.jpg (878.5 KB, 279 views)
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A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k

Last edited by destroyer X; 9th February 2013 at 08:00 PM.
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Old 10th February 2013, 06:19 AM   #544
drauns is offline drauns  Indonesia
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Quote:
Originally Posted by destroyer X View Post
No replacement of parts, just put your transistors and be happy.

regards,

Carlos
thanks for the fast-response uncle carlos

regards
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Old 10th February 2013, 07:58 AM   #545
wiljj78 is offline wiljj78  Philippines
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Default DX Thunder

I hope this time Uncle Charlie will create new amplifier called DX Thunder for powerholic, same as DX Super A but triple the power….

Go…go..goo… Uncle Charlie….

Regards,
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Old 10th February 2013, 09:03 AM   #546
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Default Here you have last revision.... showing brazilian flag colours

Brazilians are building ... we already have several builders working on it.

And Brazilian pcboard not ready yet..but people already etching and building.

Pride because of my people....because of that Brazilian flag colours surrounding the schematic.

Attention!

I do not have MJL4281A and MJL4302A models in my simulator, reason why you see other transistors...but the suggested ones, the standard ones are these models:

MJL4281A
MJL4302A

Miller capacitor was increased because of safety reasons (crazy transistors can be used and drive the amplifier into audio triggered oscilations ....models like 23193 and 23194 not suggested!

Please, do not use the transistor shown in the picture...was the only one that made the amplifier unstable.

regards,

Carlos
Attached Images
File Type: jpg Revised February 2013.jpg (911.2 KB, 261 views)
File Type: jpg 025.jpg (697.1 KB, 232 views)
File Type: jpg My power transistor.jpg (909.9 KB, 40 views)
__________________
A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k

Last edited by destroyer X; 10th February 2013 at 09:21 AM.
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Old 10th February 2013, 09:28 AM   #547
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Default If you like audio electronics and nice girls too....

Then watch Carnival from Brazil clicking in the link posted at the signature line.

Everyday, after 6PM (Brazilian time that is -3GMT) you can see live Carnival, HD, from main towns from Brasil.

Enjoy, it is for free....Youtube offering this to all of us.

regards,

Carlos
Attached Images
File Type: jpg 2z.jpg (248.3 KB, 87 views)
File Type: jpg Dx Supply - c.jpg (232.3 KB, 82 views)
File Type: jpg Carnaval Salvador da Bahia.jpg (870.5 KB, 61 views)
__________________
A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k
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Old 10th February 2013, 05:07 PM   #548
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Default A little mistake already fixed

There i had 100uf instead of 220uf.

Just that.

regards,

Carlos
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File Type: jpg A little mistake here.jpg (486.4 KB, 227 views)
__________________
A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k
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Old 11th February 2013, 09:07 AM   #549
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Default Brazilian pcboard layout being tested by Zimmer

Here you have a picture.

Amplifier will be submited to tests while watching the scope....and if approved will go to production.

regards,

Carlos
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File Type: jpg dscn0618nx.jpg (180.7 KB, 149 views)
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Old 11th February 2013, 01:08 PM   #550
wiljj78 is offline wiljj78  Philippines
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Default DX Super A SANKEN Version

In Bahrain 2 pcboard of DX Super A SANKEN version in progress.

Previous built was done succesufully with impressive result using 2SA1295/2SC3264 power transistor, now 2 more pcboard to go...

Regards,
Attached Images
File Type: jpg DX Super A Top.jpg (193.0 KB, 111 views)
File Type: jpg DX Super A Buttom.jpg (246.1 KB, 103 views)
Attached Files
File Type: pdf 2sa1295e.pdf (28.0 KB, 62 views)
File Type: pdf 2sc3264e.pdf (28.1 KB, 25 views)
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