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Old 8th January 2013, 11:23 PM   #421
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Default Juan have prepared a gift to me.... a kit of parts

He is waiting some power resistors from his provider and will ship these parts to Uncle Charlie.

This is kind...this is nice...this is friendly.

You see coils he made using his bare hands and a pencil as a core.... we have no green enamelled wire in Brazil... despite we have a free importation harbour inside Amazon Jungle, town of Manaus.... where you have river Amazonas.

regards,

Carlos
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File Type: jpg Parts kit from Juan to Uncle Charlie.jpg (701.9 KB, 400 views)
File Type: jpg Manaus Harbour.jpg (724.1 KB, 360 views)
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Last edited by destroyer X; 8th January 2013 at 11:28 PM.
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Old 10th January 2013, 02:16 PM   #422
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Yes dear Carlos probably today I might get the package from mail and I send you the complete set of resistors and the coils I already prepare them and thin them too.


I made a quick video updates of my build so you guys can see it too. here is the coil thinned, is that the right word?, I apologies my poor English.


Dx Super A quick updates - YouTube

Regards
Juan
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File Type: jpg coils.jpg (258.2 KB, 307 views)
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Old 10th January 2013, 05:31 PM   #423
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Kerosene works great for cleaning dusty PCB


Kerosone cleaning - YouTube


Regards

Juan
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Old 10th January 2013, 08:48 PM   #424
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Default Nice work Juan... i just cannot wait for my boards

I have made some xerox copies to make the power supply using the hot iron method...i have some fiberglass and copper boards and i will make two units for my use.

This way, i gonna check it real life...then we will be able to post it in the Supply forum and also here, because it was made to be used together the Dx Super A... this kind of supply is a need to reduce cost... electrolitic condensers are very expensive and we gonna need a lot of them to operate 2 ohms and full power...with this kind of supply (other maker will fit too, not needed to be a Dx Supply of course) you will save money spent with condensers and will have electronic filter and voltage stabilization.

regards,

Carlos
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Old 11th January 2013, 11:12 AM   #425
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Small suggestion use Mineral Turpentine Oil, which is as cheap as kerosine oil and available at all paint shops, works better than Kerosine Oil
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Old 11th January 2013, 12:56 PM   #426
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Default Mineral turpentine oil..... i never heard about that

I will research in google.

thank you by this tip.

regards,

Carlos
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Old 11th January 2013, 01:25 PM   #427
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Can IRFP240/9240 be used instead of MJL4281/4302?
do they perform as good as MJL4281/4302?
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Old 11th January 2013, 02:20 PM   #428
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Default No!... these IRFP are Field Effect Transistors and does not operate in this circuit

I have shown a non tested, not approved, nor tuned or tweaked suggestion made to a friend start from that point and develop the circuit.... that one does not sound fine.

The original circuit uses BJT (Bipolar Junction Transistors)...and they are different when compared to FET (Field Effect Transistors)...they are both transistors, but biasing voltage is different, stand by current is different and performance is different.

You cannot remove BJT and install FET without make huge changes in your circuit.... you also cannot do the opposite.

regards,

Carlos
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Old 16th January 2013, 10:33 AM   #429
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Default We have people already building in Brazil and some guys from the International

comunitty too.

This one if Bruno from Portugal.

An artistic concept

regards,

Carlos
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File Type: jpg Dx Super A concept by Carcass Bruno.jpg (331.2 KB, 199 views)
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Old 16th January 2013, 12:40 PM   #430
carcass is offline carcass  Portugal
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Quote:
Originally Posted by vedmitraa View Post
Small suggestion use Mineral Turpentine Oil, which is as cheap as kerosine oil and available at all paint shops, works better than Kerosine Oil
Carlos, see Terebintina ? Wikipédia, a enciclopédia livre

And I do think that in Portuguese it's written Terebentina!
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