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Destroyer x Amplifier...Dx amp...my amplifier
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Old 15th February 2007, 08:59 PM   #61
sixtek is offline sixtek
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Hi,

Quote:
Use fuses in the output
That will causes audible distorsions.

Quote:
Sensitivity is normal... 750 milivolts will drive it to full undistorted power.... simulator shown 318...but i did not test real world..i have not load to this range of power.
Am I right you can't calculate the gain of your design?

Quote:
Carefull not to miss the miller capacitor, those transistors goes to 100 Megahertz in the datasheet...but real world they go to 150 or more!
100MHz transition frequency doesn't mean that the device will works at 100MHz. Do you know what Ft means on datasheet?

Quote:
Use two pairs...maybe more if you will open all volume using 4 ohms, with a continuous tone...a steady tone or some music very constant in level..different form the standard average leveled musics.
I would suggest you to do SOA calculations for 45░ and 60░ phase angles.
 
Old 16th February 2007, 11:13 AM   #62
destroyer X is offline destroyer X  Brazil
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Default Interesting...when a "brick" enter a nice thread, broke the rithm

Interesting as a single bad apple can destroy all around.

I am still listening those amplifiers, and there are friends constructing...some of them local non internet friends...but i will produce picture to you to see those constructions as soon as possible.

Brick was nice...isnt...ahhhahahhha!

The brick is in my ignore list...as not kind enougth, and many friends complained...i am not guilty!!!...forum management is tollerant with those things...what can i do?

Graham is jumping 3 feet high remembering kind TLF9999 and other flying bricks.

I cannot read Mr. Brick, as i pushed the ignore button...but i am not missing that..for sure.

Let them put sheet..... sheet filled with garbage data in our nice forum.

regards,

Carlos
 
Old 16th February 2007, 11:41 AM   #63
lineup is offline lineup  Sweden
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Quote:
Originally posted by destroyer X

Interesting as a single bad apple can destroy all around.
----------
regards, Carlos
I agree with your feelings, Carlos
I can say me too was a bit surprised by tone in sixtek post.
I can not remember has has been in this topic before.
Now, I wont involve further.
This is not my business, so I like to keep my nose out of it.

When 2 party fight, it does not make it better #3 join the fight.
does it

========================================

Quote:
sixtek said:

Use fuses in the output?

That will causes audible distorsions.
.

How do you know this, sixtek?
I mean, when you heard this, last time,
how did it sound?

It is my opinion, maybe it is an imaginary thing.
We all know that these supposed sound degradation phenomenons
can many times be cause after the sound has passed the physical ears
of the listener.


Anyway,
I prefer fuses, which I think sound like nothing,
than to get my loved Loudspeakers Burnt and Destroyed.

Carlos is publishing an amplifier here.
He maybe do not want any builder, to need to buy new Speakers

Even if we can not have too much responsibility for what anyone build from our schematics.
This is something members of forum know.
What you build is Your Thing.


Regards, lineup
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Old 16th February 2007, 12:44 PM   #64
richie00boy is offline richie00boy  United Kingdom
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If there is fuses in the supply rails to each individual amp then there is no need for a fuse in the output line. It has been shown by Self that such a fuse is non-linear with current and causes distortion.

Otherwise, build this design and be happy
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Old 16th February 2007, 02:01 PM   #65
destroyer X is offline destroyer X  Brazil
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Default Sometimes happens damage in the amplifier..some short

circuit may happen...in special audiophiles alike me...old guys with damage vision, tweaking, use to produce shorts.

When this happens, one of the rails voltage goes to output.... and this means high current when using low impedance speakers.

Because of that, i have to use fuses in my output also...not only in the rails.

My fuses are hand made using thin wire, tested in advance to see how much current will melt it under environment normal temperature....this wire is soldered over some burned fuse...this way i have sure that the fuse unit is low in resistance, because the fuse wire is soldered over the fuse metal extremes, and fuse metalic parts are soldered over the board....or under the board ,if you prefer, when using the standard, old and traditional way to construct amplifiers.

Beeing an electronics Consultant Ritchie, it is normal your ideas...some standard amplifier, factory made, protected inside a case...not one tweaking and without melted solder dropping over the board...some screw falling down over the boad...a part of transistor lead cutted because too long to be used can fall down over the board and explode the whole thing too.

Inside this world, the audiophile world, despite many guys think it is a more precise world, with better schematics and better amplifiers, there are something less precise...the home do it yourself hand made construction that include a lot of possibilities of accidents.

I love to cook too Ritchie.... La cuisinne Franšaise c'est ma preference!

Thank you Ritchie.

Thank you Lineup.

regards,

Carlos
 
Old 16th February 2007, 02:04 PM   #66
richie00boy is offline richie00boy  United Kingdom
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Carlos what you are making is basically a DIY fuse just like what is inside a normal fuse. It's just as non-linear.

No you still don't need to use an output fuse.

The output short will draw high hurrent for a moment and blow the rail fuse which will cease the current. The voicecoil should be OK for this short duration, especially as the rail fuse rating should be the same as what you would use to 'protect' the speaker itself additionally anyway.
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Old 16th February 2007, 02:16 PM   #67
lineup is offline lineup  Sweden
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Default Re: Sometimes happens damage in the amplifier..some short

Quote:
Originally posted by destroyer X

My fuses are hand made using thin wire,
tested in advance to see how much current will melt it under environment normal temperature
regards,Carlos
Quote:
Originally posted by richie00boy

Carlos what you are making is basically a DIY fuse just like what is inside a normal fuse.
It's just as non-linear.
.
I have done such a fuse one time.
Using only a thin suitable wire piece.

But also Loudspeaker Cable is a wire ......
If something of very low resistance is a bit non-linear,
this means not much, if the TOTAL impedance is very much bigger.

Loudspeaker is at least ~4 Ohm and sometimes ~8 Ohm.

The influence of a part of The Total Load is proportional
to the impedance of this part, in relation to Total Impedance of load.


lineup
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Old 16th February 2007, 02:24 PM   #68
destroyer X is offline destroyer X  Brazil
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Default Thank you Ritchie...the fuse is not needed


All rigth..the rail fuse will melt...so, do not use that one.

regards,

Carlos
 
Old 16th February 2007, 02:28 PM   #69
richie00boy is offline richie00boy  United Kingdom
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I agree with you Lineup. But there is still no need to use a speaker fuse, see my last. I don't see the point of using unecessary parts, in fact Carlos himself said the whole philosophy of this amp was to strip out unecessary parts.

It is essential to use rail fuses to protect the amp anyway so you might as well use them to help protect the speaker too. But in the supply line their non-linearity will be corrected somewhat by negative feedback of the amp output and the amp PSRR.

Enjoy listening to this amp happy knowing that your speakers are safe and that you have some extra spare rail fuses
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Old 16th February 2007, 02:43 PM   #70
destroyer X is offline destroyer X  Brazil
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Default Constructors wanted!...amplifier already designed and tested need audiophiles

to construct, to compare and to test amplifier.

In this DO IT YOURSELF forum, there are hundreds of around the clock consultants and advisers.

There are thousands that can find errors, defects and possible improovements.

There are millions able to re-design the whole thing.

Also the "simulator people" can do a nice job, also my own simulator can do it.

I am needing, and searching the ones that will test...will construct, will listen, will compare.

To search for legs in sneaks, possible sneak oils i can do it by myself.

Help constructors, to avoid the thread turns a book of theories.

regards,

Carlos
 

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