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Old 4th December 2012, 07:36 AM   #311
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Default Dx Super A playing at Bazzo's home in São Paulo

This guy repairs automobile steel parts.... we call here "lanterneiro" or "funileiro", i do not know the name of someone that fixes damage in your car doors, for instance.

teste cabeçote 02 - YouTube!

teste cabeçote 01 - YouTube!

They call power unit as "cabeçote"...that means top of an engine, where the valves are.... where the overhead cam shaft is.... the name came from this analogy.

Brazil is too big, we have several "languages" in our country..also music is very different ... this ones sound strange to me.

http://www.youtube.com/watch?feature...&v=DhfqQqeFP4A

Creativity and passion...also a very bad acoustic (ceramic tiles in the floor) and the terrible tone control added to an awfull digital camera resulted more or less.

regards,

Carlos
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Last edited by destroyer X; 4th December 2012 at 07:40 AM.
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Old 4th December 2012, 09:19 AM   #312
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Good morning Carlão!

The tone control works correctly, with pots to the center of resistance, the frequencies that come out that are the same ...

I did extensive testing before installing, because if I'm not pleased, I throw the trash ... lol

The real problem is the same of sony digital camera, you can not play what I hear ... And what I hear, is simply indescribable!!

Regards ...
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Old 4th December 2012, 10:22 AM   #313
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Default Thanks Renato, you are right, these cameras are not good

for audio recording.

Sorry, i hate tone controls...i do like sound directly into the power amplifier input connector...more pure sonics...tone control introduces distortion.

Despite that i have appreciated your videos a lot.

thank you,

regards,

Carlos
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Old 4th December 2012, 10:43 AM   #314
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Yes, blame the tone controls become completely unnecessary, since the signal source is clean, which is not often ... So, I implemented this to compensate for bad signal sources, with some deficiency in attendance ...

I tested the controls, the LM 1036 proved very effective, without distorting the perceptual level, unlike other tone controls that do not use CI, but resources for separating frequencies through resistors and capacitors ... I do not like these ...

Hug!

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Old 4th December 2012, 11:45 AM   #315
AndrewT is offline AndrewT  Scotland
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Rena,
I don't know what opamp you are using as the unity gain buffer, but do check the datasheet for information on the link from Out to -IN. Some opamps prefer to see a low value resistor in this link, to help prevent misbehaviour.

Check that you have HF decoupling in the correct locations.
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Old 4th December 2012, 11:51 AM   #316
AndrewT is offline AndrewT  Scotland
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DX is suggesting that some Members/Builders may want to use the fuse alternative resistor to check for amplifier current when using Ibias approaching 1A. Don't do this.

If the PSU is putting out say +-40Vdc when the amplifier is not connected and this drops to +-39.5Vdc when the amplifier is connected then the setting of the bias will further reduce the supply at the amplifier power input terminals slightly, maybe down to +-38Vdc when the bias is set to 100mA to 200mA.
If you insert a 10r resistor instead of the fuse, then the output bias will change from the set value. It might drop to 10mA, but much worse the supply voltage after the resistor will drop badly.
200mA through a 10r resistor will drop 2V.The amplifier will have +-38Vdc at the power terminals but it will only have +-36Vdc after the resistors.

This gets MUCH WORSE if you set the bias to 500mA, Vcc/Vee becomes +-33Vdc,
@ 700mA: +-31Vdc, @ 1A: +-28Vdc

DO NOT SET output bias with resistors replacing the fuses.

The amplifier must see the full supply voltage when you set the output bias.
Use the Vre method to check the output bias current.
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Old 4th December 2012, 04:58 PM   #317
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Default We are still discussing about resistors

Me, Zimmer and Juan.

It is funny.

regards,

Carlos
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File Type: jpg DSCI1699.JPG (418.0 KB, 349 views)
File Type: jpg DSCI1703.JPG (599.7 KB, 328 views)
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Old 4th December 2012, 07:34 PM   #318
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Talking Dx Super A BIAS

Here is a quick instructional information of how to adjust the bias on the Dx Super A.

Regards
Juan
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File Type: png Dx Super A adjustments by Carlos Mergulhão 1.png (232.1 KB, 307 views)
File Type: png Dx Super A adjustments by Carlos Mergulhão 2.png (721.8 KB, 302 views)
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File Type: pdf Dx Super A adjustments by Carlos Mergulhão.pdf (180.3 KB, 146 views)
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Old 4th December 2012, 07:48 PM   #319
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Default Great Vargas...we are turning into a great team

Long life to the Corporation, the Union of the best world audiophiles..the real DIY folks.

regards,

Carlos
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Old 5th December 2012, 03:02 AM   #320
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Here are the files for etching hot iron and UV light sensitive boards, there are confusion of if the files is mirrored or no I'm giving you both normal and mirrored files PDF format. chose the one you need not all printer work the same way.


Regards
Juan

Last edited by vargasmongo3435; 5th December 2012 at 03:08 AM.
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