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Old 22nd April 2007, 11:32 PM   #991
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Default Thank you Klaas.... i am feeling very confortable reading your texts..friendly words


My friend Daniel is also starting to design his own..he wanted to construct Dx, but i told him he could do his own....maybe we gonna have a Dx cousin in the future.

I think this is great...any variations, any differences will be extremelly apreciated, also will show more options to forum friends...not exposing other designers circuit secrets, beeing different, i will feel happy.

I am having fun with dear Daniel, calling him "looser" in advance, as i have tested all options, Vas mirrored, ccs and other circuit practices..i know this simple one is nice.

I have tried that supply in the past Hugh, as it is a Ampex Videotape (open reel) broadcasting supply circuit....not mine....many times i have tested with other amplifiers..maybe 6, and i remember once i have used your Aksa 55, two years ago, for those testing purposes.

Result confuses me Hugh.... i am still in doubts about the advantage of those supplies....i have to listen more to conclude.

Of course, technically, no doubts the amplifier will run better powered with a stabilized supply...but i really do not know about sonics.... tests i made were not conclusive to me...maybe i am blocked to accept that advantage because turn the amplifier enormous, having heat from those other heatsinks to reduce the voltage...i use to react against complications...my problem is this.

But some loss of voltage may turn some bass tones decay interesting too...as real life bass sound has big decay...and longer time than recordings using electronic bass or sinthetizers..those things turns me confused Hugh.

Well...that supply can be arranged to the voltage people wants...i will be happy to arrange values and parts to fit constructor needs.

regards,

Carlos
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Old 23rd April 2007, 07:27 AM   #992
Nordic is offline Nordic  South Africa
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http://www.pedjarogic.com/gc/supplies.htm

Ever seen the supply shown at the bottom of that page....?

I have PCB files for it, but I guess it would need some upgradeing in the transistor area (which I know too little of yet), to cope with the dx

It is a discrete regulator without global feedback
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Old 23rd April 2007, 08:51 AM   #993
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Default Those discrete ones have not error amplifier Nordic.


This turns the supply unable to correct voltages in an efficient way.

The one using chip may be good...the discrete ones are worst than the Ampex one i have shown.

The Ampex supply was used by professional Broadcasting Equipment....those things are safe, are reliable Nordic...it is another history.

Also were used by decades...i also used 8 supplies with that schematic into audio equipments, and more than 20 were made to Radio Amateus, for SSB transmitter purposes.... having 20 amperes of current and that current jumped from 1 to 20 amperes in a matter of microseconds...and the schematic could face that and correct the voltage not to have losses.

The real good supplies, there are hundreds, are the ones able to read the voltage losses in the output, and fast reduce the series pass transistor resistance to compensate..without that error detection, supply is not good enougth.

regards,

Carlos
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Old 23rd April 2007, 03:05 PM   #994
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Nordic
http://www.pedjarogic.com/gc/supplies.htm

Ever seen the supply shown at the bottom of that page....?

I have PCB files for it, but I guess it would need some upgradeing in the transistor area (which I know too little of yet), to cope with the dx

It is a discrete regulator without global feedback
I don't know enough to comment on Carlos's reservations about this as a regulator for the full Dx, but if you leave out the final transistor and just use the BD 139/140 darlington, it could make a nice supply for the front end of the amp. I've used it for some pre-amp and crossover circuits.

Sheldon
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Old 23rd April 2007, 07:04 PM   #995
ostry is offline ostry  Poland
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Hi,

I've redesigned PCB for Carlos PSU, electrolytic caps have 20mm diameter. I've tried to make it as compact as possible

It has a plane ground topology.

regards
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File Type: zip dx_psu_v2.zip (93.4 KB, 133 views)
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Old 23rd April 2007, 07:11 PM   #996
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Default Thank you Ostry...nice and better board.

Related Sheldon.

The use you gave was perfect, as those construction, at least the ones that have not and error amplifier, sensing the output voltage....some transistor with the base sensing the output and feeding back the voltage losses into the serial pass regulator, will not hold current...will not be able to control power.

If power is used, the voltage will be reduced..this is my point.

To use to low consumption circuits, pr amplifiers, power amplifier input circuitry or other uses it will be excelent.....not to Dx amplifier....voltage will go down when some bass puch will be "processed" inside the power amplifier.

I have to clarify, as published into this amplifier thread, may create the fake idea that is something to be used together Dx amplifier, and this will result very bad.

That's the point..not that the regulators are not good., they are fine and hardly used for decades..but not not adequated to heavy duty job.

regards,

Carlos
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Old 23rd April 2007, 07:36 PM   #997
Nordic is offline Nordic  South Africa
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Hey, I laid out a PCB as well for the PSU useing foil caps and stargrounding... It is a little diffirent in the sense that it caters for a little better thermal stability by useing larger rated/more resistors etc... I am still very occopied with the information I learned yesterday about how thermal responces induce distortion, and reconned a bit more mass won't hurt anyone...
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Old 23rd April 2007, 08:30 PM   #998
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Default A very pretty work Nordic...Dx supply by Nordic.....fine!


I was searching for the coil....the one in series....over R7 and R8....well..i think despite not shown it is there....the supply will work nice with the coil in the circuit.

Well....what about your transformers.... i think today is the dead line time to receive.

Have they told you something about your transformers arrival?

Have you started some work related the case?

Will you assemble in a piece of wood and them to install that wood inside a case?

Tell us some about your ideas related the enclosure to the amplifier...what is boiling inside your head?

regards,

Carlos
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Old 23rd April 2007, 09:01 PM   #999
Nordic is offline Nordic  South Africa
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Hey charlie, the inductors must be wound around the square resistors....

I think the transformers will only be here Wednesday or so, I kept very busy today, as I have to see a dermatologist tomorrow to remove a small wart on my upper arm, and I'm just short of phobic of the medical profession by now... to rephrase that I'm crap scared....

I cant realy plan the design much further than the basic concepts I posted before as I don't know how big the transformers will be, scored alot of wood from the old door I took off.... I might line the wood case non metal sides with thin case plates, avoiding more metalwork....
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Old 23rd April 2007, 10:42 PM   #1000
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Default I finish my Dentist treatment.... a hell remotion of a nerve.


And some other small things to fix...i am free of doctors..i hope i will be very distant from them for some years long.

Sorry for you....as you will visit a doctor.... problem is that they do not feel pain when doing job into us.... we are mobile meat to be cutted for some butchers.

Your interest to produce the PSU board was very kind.... fully apreciated that.

Good wooden doors can turn nice cases....hummmmm i am watching a gate left in an abandoned piece of land in my neigthborhood now...hummmmm.

Must be wound over the squared resistance?...aahahhaha...i think i have already readed that.

regards,

Carlos
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