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Old 2nd May 2008, 04:05 PM   #5051
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Default Here you have an image, the Dx Turbo


one channel shown, operating with 64 volts, full power and loaded into 4 ohms.

Stand by voltage is 70 volts simetrical.

regards,

Carlos
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Old 2nd May 2008, 06:26 PM   #5052
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Default Another local friend made Dx Amplifier board.


And i like this one....it is not small, but has the VBE multiplier transistor on board.... the zobel ground goes using copper lines in the place of wires (because people had discussed grounding different ideas those early days).... also input condenser ground is easier, the E links removed...well.... i found it good.

The board is beeing tested by the friend that made the board layout.

regards,

Carlos
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Old 2nd May 2008, 06:27 PM   #5053
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Default Here is the image in PDF.


regards,

Carlos
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File Type: pdf dx amplifier.pdf (94.3 KB, 189 views)
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Old 2nd May 2008, 06:29 PM   #5054
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Default Board dimensions are 90 x 89 milimeters


I have not the image showing parts with values.... for a while.

regards,

Carlos
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Old 3rd May 2008, 03:22 AM   #5055
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Default carlos uncle, I need help to solve problem

dear uncle carlos,

good morning. i had made two board for sterio precision8.1.

one is operatiing without any problem in high voltage like 56+-.

one got problem. if i operate in low 22-+ voltage , it works well, but when i apply 56v-+ it is blowing my fuse and diod D10( 1n4001) (-) volt side and sparks my 0.33ohms resister too. i checked the board but found nothing is wrong....i know definetly there is somehtings went wrong. so what could be wrong? pls advice me. all transistors are ok.

wish for your good health.

thank you
michael
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Old 3rd May 2008, 04:11 AM   #5056
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Default DX-one more question to uncle carlos

uncle carlos, i neede to ask you one more question. when i apply high voltage 56+- and power on, it first sound comming loude "pik" then get quiet...

is there anythings went wrong? it's hpns on both carcuits.

thank you.
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Old 3rd May 2008, 04:44 AM   #5057
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Default I cannot tell you what is wrong into your board


For sure you have made a mistake during the construction... something was assembled wrong and now you have burned transistors...if your resistance was burned is because you have shorts.... transistors burned...short circuit...and now you have to remove all transistors and test them out from the circuit.

Use protective resistances next time you finish to build and in advance to power your amplifier... they could have avoided that accident you had.

We use to make mistakes...we are humans...you were lucky that you have made mistake in one of the boards only.

You have the other board to compare the transistor position and the resistance values you have installed....watching one board, the one is working fine, and checking the defective one you will be able to see what is wrong..... search for short under the board because of solder...check if something was installed inverted.

Amplifiers need to adjust bias properly...maybe this is your problem.

If you have not the knowledge to adjust audio circuits, go to Dx Amplifier thread and read it... at least the posts you have diagrams and tutorials, sketches, and schematics.... you will find precious informations there.

Would be a very big magic, if i could watch you board from Brazil and tell you what is wrong into your construction .... only youself can do that searching for bugs.

regards,

Carlos
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Old 3rd May 2008, 05:04 AM   #5058
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Default A friend have asked a Quasi complementary version, this time using NPN


Here it is....maybe someone will appreciate to use his NPN transistors that are bothering buzzing around.

regards,

Carlos
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File Type: pdf dx pra meter npn quasi.pdf (11.2 KB, 140 views)
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Old 3rd May 2008, 05:27 AM   #5059
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space2000,

D10 should be an 1N4004 with 400V rating. The 1N4001 you are using is rated at 50V. This may be breaking down, causing your problem. As Carlos says, you will need to check your other components as well for damage.

billabong
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Old 3rd May 2008, 05:30 AM   #5060
sr2002 is offline sr2002  India
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wow nice amp destroyer!!!

May i ask which schematic are u using?

what is the thd and wattage?
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