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Old 29th November 2012, 02:30 PM   #291
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Default Ahahahah!.. the same as mine English

It is more Engrisher than English.

Bom te ver por aqui meu amigo Renato.....muito bom isso.

Very good as i can see you here my dear friend Renato.... this is really very good.

regards,

Carlos
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Old 30th November 2012, 05:50 PM   #292
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Default Attention!.... i have made a mistake.

The series protective resistor you may imagine we are using is wrong.... the correct value is 10 ohms and 10 watts...the one we used previously will go in flames because it was not dimensioned to Super A.....cannot face 10 watts each rail.

This way, if you have in your pcboard layout, ignore and remove it, the fuse will bypass making a fuse bridge and install outside the pcboard two big resistors or 10 ohms and 10 watts each one of them..... measure the voltage drop above these resistor extremes (DC volts) and adjust your trimpot to measure 2.5 volts.

After you do that, then your amplifier seems correct and fine as you could adjust..check your off set voltage..if it is less than 25 mV go ahead..if not check for mistakes in your contruction...if it results from 25 mV to 100mV then call uncle charlie.

If you already have adjusted the 2.5 volts and the off set is fine....of course all heatsinks in place, then you check the voltage drop directly above the power emitter resistors (0.22 ohms)..there you should measure 55 milivolts aproximatelly because you are using 4 output pairs and current is shared rail by rail.

regards,

Carlos
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Old 30th November 2012, 07:45 PM   #293
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Default Juan have ordered 10 boards, and have exagerated

in features... copper thickness...colour, solder mask and a lot of things that does not sound but increase the price a lot.

this resulted in 28 USD each...a hell expensive... i told him to sell some pcboards by 18 USD because this was the price paid by the Supercharged boards that had the same size despite not all the features this one has.

He exagerated because passion by his design...matter of fact is that this board is the most beautifull ever done by my people...it is fully symetrical and very well done.

This way.... because we fail to talk about these details, he gonna have some loss of money.

Well...he do not even want to sell them.....hehehehe... passion!

Let it be.

regards,

Carlos
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Old 1st December 2012, 09:38 AM   #294
AndrewT is offline AndrewT  Scotland
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Setting 2.5V across a 10r resistor is not 10W.
It is 625mW. A 2W resistor will do this duty in the short time it takes to set the current.

But this is the wrong way to check and set the output bias.

Correct start up and checking procedure.

Start up your project via a bulb tester with a 100r in the fuse holders.
Check that the output bias current is zero amperes.
Measure the voltage across the 100r resistor.
This voltage tells you the current the amplifier is drawing when there is no output bias.

Power down.

Put back the fuse/s. Power up direct off the mains socket.
Measure the Vre voltage. Option: check all the Vre to see if they all read the same.
Adjust the Vbe voltage while repeatedly checking Vre.
Keep increasing till the maplifier has reached about 80% of the Vre you want.
Leave the
Leave the amplifier with no load to heat soak for 30moinutes. Come back and check and reset the Vre to 100% of the value you want.
Leave the amplifier on heatsoak and recheck Vre and output bias every 10minutes. When you are sure the bias and offset are stable and consistent, then you can connect a dummy load. Recheck the bias and offset every 10 minutes over a further hour or two or even three, to be sure you know the amplifier is behaving.

Now switch off and let the amplifier go stone cold.

Start up and check the offset from start up through the warm up phase. Check the Vre.
If you are happy the amplifier does not send a big pulse through the dummy load during start up and warm up, then now is the time to attach a cheap speaker and test with some quiet music.

DO NOT set the Vre with the 10r, or any resistor in the fuse position.
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Last edited by AndrewT; 1st December 2012 at 09:41 AM.
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Old 1st December 2012, 04:03 PM   #295
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Default Newton started his tests...he will continue latter on

and this means it is all right... adjustment was easy, off set fine and all stable during the first power up moment.

He had to go out with the family to buy a house to weekend... a small farm to his family, reason why he will continue latter.

He said the amplifier is hot....of course he is talking about temperature because he have not listened yet.... only assembled and adjusted and found that temperature rise to 43 degrées celsius...yes..it is really hot.

In his home the temperature is 27 degrées celsius.... while he is out, a daugther will upload the video showing the adjustment...next will be listening tests.

regards,

Carlos
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Old 2nd December 2012, 06:24 AM   #296
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Default This one is a Blame in process of modification to Dx Super A

You see the fan blowers already in place.

Made in Brazil... this guy repairs automobile

regards,

Carlos
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File Type: jpg dsc07662l.jpg (595.2 KB, 76 views)
File Type: jpg dsc07664n.jpg (581.6 KB, 86 views)
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Old 2nd December 2012, 03:17 PM   #297
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Default This Dx Super A gonna be alike a torpedo destroying other amplifiers

So, we have decided to make it look agressive.... alike a torpedo boat .... the resistors 10 ohms 10 watts or even 10 ohms 20 watts will look alike torpedo lauchers, they can go above, atop the pcboard and fuzes can be below..these are series protective resistors for adjustment purposes and goes bypassed, or jumped by the fuse after we adjust the stand by current.

As people can choice 250mA, or 500mA and even 1A, then i decide to put huge ones there.

We have stopped the board factory, we gonna make this modification and we gonna order again with some more units for ourselves...instead of 10 will be 14 units for testing procedures... 10 will be sold...will vanish really fast.

A video about....playing with Juan and Zimmer about the stuff:

Ahahahahha! - YouTube

regards,

Carlos
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File Type: jpg revell-pt109-boat.jpg (298.7 KB, 59 views)
File Type: jpg Heheheheh.jpg (178.5 KB, 106 views)
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Old 2nd December 2012, 06:44 PM   #298
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Default A pity that i have no room to a big torpedo launcher

This way gonna be a smaller one.

regards,

Carlos
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File Type: jpg Torpedo.jpg (580.3 KB, 117 views)
File Type: jpg Torpedo 2.jpg (870.1 KB, 114 views)
File Type: jpg Grenade launcher.jpg (41.1 KB, 85 views)
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Last edited by destroyer X; 2nd December 2012 at 06:55 PM.
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Old 2nd December 2012, 07:09 PM   #299
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Yes I wish it can be bigger but there is no more room for it, what I did is a representation of the resistor, like a reminder that need a 10R 10W resistor or 5 watt like Carlos said. after the fuse holder is installed the graphical will be hidden so is ok, what I did is add a 2 more holes each side of the board so if the resistor is longer, it can be easily place, there are some brands of resistors that have the length of about 45 mm that can fit to it, I change the silkscreen for the fuse holder and now it will be placed it at the bottom of the board, anyway the fuse FUSE holder drawing is not going to be seen anymore from the top, but now it can be seen from the bottom of the board.


Regards
Juan
Attached Images
File Type: jpg RSD SERIES.jpg (79.6 KB, 45 views)
File Type: png drawing2.png (115.0 KB, 72 views)
File Type: png 56564654.PNG (23.3 KB, 68 views)
File Type: png x Super A can be updated 23hoy.png (701.7 KB, 61 views)
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File Type: pdf Dx Super A.LAY]er.pdf (81.3 KB, 119 views)

Last edited by vargasmongo3435; 2nd December 2012 at 07:17 PM. Reason: one more image added to it
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Old 3rd December 2012, 07:20 AM   #300
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Default Attention, be aware about the series protective resistor

Here:

Cuidado para não destruir o amplificador - YouTube

Carlos
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