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Destroyer x Amplifier...Dx amp...my amplifier
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Old 27th May 2007, 11:30 AM   #1561
fotios is offline fotios  Greece
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Default Re: More well come constructors....less welcome modifiers

Quote:
Originally posted by destroyer X

But i have friends that knows what i am telling all forum folks now, and they perceived, once more, the strange question...too much obvious to fótios, as he is deeply experienced.

- "Everybody is free to connect any input terminating resistor into
the input terminals, for source loading purposes... the Dx Amp.
is a general purpose amplifier, and it will work either HS or SS
source equipment"

Carlos
Any way. I placed a simple question and i don't had an answeer. Finally what is your suggestion. There is or there is not the need of an input terminating resistor?
Regards
Fotios
 
Old 27th May 2007, 01:38 PM   #1562
destroyer X is offline destroyer X  Brazil
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Default Dx amplifier is thermally coupled


Greg made a very nice board.

I am very happy constructing over his board.

regards,

Carlos
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File Type: jpg thermal coupled.jpg (70.2 KB, 343 views)
 
Old 27th May 2007, 01:40 PM   #1563
destroyer X is offline destroyer X  Brazil
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Default As you see, dear Inex, i have nothing against BC557


My Design assistant, my dear daugther Larissa, is very happy with the amplifier board and sending many thanks to "uncle Greg"

regards,

Carlos
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File Type: jpg design assistant.jpg (59.6 KB, 347 views)
 
Old 27th May 2007, 01:44 PM   #1564
destroyer X is offline destroyer X  Brazil
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Default Dx amplifier sound fine, and can make all type of guys happy


To the ones that love "snake legs" or "snake oil"....mine personal, customised unit, are filled with some.

I do not like empty spaces or holes...as i have not binding posts, no multiturns trimpot and some parts where excluded from the design....i prefere to fill those empty spaces.

And kidding, as i am with a very special good mood today.

Ahahahahahha.

regards,

Carlos
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File Type: gif snake oil too.gif (88.7 KB, 366 views)
 
Old 27th May 2007, 01:47 PM   #1565
destroyer X is offline destroyer X  Brazil
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Default Here is your answer Mr. Fótios


"Everybody is free to connect any input terminating resistor into
the input terminals, for source loading purposes... the Dx Amp.
is a general purpose amplifier, and it will work either HS or SS
source equipment"

The volume trimpot or volume potenciometer will behave as a termination too, and can be used.

regards,

Carlos
 
Old 27th May 2007, 01:59 PM   #1566
Graham Maynard is offline Graham Maynard  United Kingdom
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Hi Fotios,

You wrote >>
Carlos i have a legitimate querry. In this schematic, it does not appears an input terminating resistor. I mean that, before anything else in circuit. Have you attached some outboard input potentiometer?<<


I don't see how you can expect Carlos to answer this question.

He has provided a general purpose power amplifier schematic.

Carlos cannot know what way any user would wish to use the Dx thereafter.

Some folks use a volume control. Some folks use a pre-amp. Some folks use a line driver. Some folks use as a slave from the output of another amplifier. Some folks drive from an I-pod or portable CD. Some folks drive from a DAC or computer interface.

Yours might seem a simple question, but it cannot be answered be a universal statement, so if I were Carlos I could only answer by asking you - surely it is the case that the choice is yours, and whether you want to use your own line terminating resistor is up to you alone, as indeed it is with the majority of power amplifier designs ?

Cheers ......... Graham.
 
Old 27th May 2007, 05:40 PM   #1567
destroyer X is offline destroyer X  Brazil
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Default Dx amplifier, to my own use is ready


Was made using junk parts...nothing is new...only the board.

Was hard to install resistances...i have to sand to reduce lead diameter to fit the modern sized holes.

I am happy will my unit.

regards,

Carlos
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File Type: jpg dx ready.jpg (81.1 KB, 335 views)
 
Old 27th May 2007, 05:41 PM   #1568
destroyer X is offline destroyer X  Brazil
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Default Junk parts do not sound junk, ugly or anything strange


The opposite...they are tested parts...already passed by thousand of burn in hours.

regards,

Carlos
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File Type: jpg side view.jpg (69.0 KB, 323 views)
 
Old 27th May 2007, 05:44 PM   #1569
destroyer X is offline destroyer X  Brazil
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Default Some strange parts you may find, are parts used to fill empty places, or....

to cover binding post holes..... i use under wires, not to be seen.

Under the board you have the off set trimpot also, the wires that connect VBE and zobel filter grounding wire.

Everything, speaker, supply and input wires goes under the board....also the VBe multiplier wiring (twisted to create capacitance to couple colector with emitter) goes running under the board.

regards,

Carlos
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File Type: jpg under angle.jpg (82.6 KB, 269 views)
 
Old 27th May 2007, 05:48 PM   #1570
destroyer X is offline destroyer X  Brazil
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Default You will see the VBe multiplier board at left....


placed there only to show you...it will move to under the board, will be attached to the heatsink but under the board....not to be watched...it has to colect heat, not to be observed.

The input is not "shorted" by a 27 picofarads ceramic capacitor..it is there only to fill the empty holes.... this value will not work, exception will be the presence of 100 Megahertz and upper frequencies that will be tuned by this capacitor and the inductances present in the circuit.... well... will not pass to next filtering..so...do not worry and be happy.

Also i have not a broadcasting station in this building.... none "enormous" signal to bother us.

regards,

Carlos
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File Type: jpg under board.jpg (51.0 KB, 243 views)
 

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