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Old 4th April 2013, 09:05 PM   #101
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Default Preparing Zimmer layout - part three

Dx Supply - Zimmer layout - start produce & test - part THREE - YouTube

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 4th April 2013, 09:31 PM   #102
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Default Assembling Dx Supply - part four

Dx Supply - Zimmer layout - start produce & test - part FOUR - YouTube

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 6th April 2013, 02:39 PM   #103
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Default Man at work down in Brazil

Have a good weekend...i gonna work hard today.

Carlos
Attached Images
File Type: jpg How the heatsinks will be applied.jpg (190.1 KB, 366 views)
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 6th April 2013, 06:07 PM   #104
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Default Zimmer layout was tested and approved

Zimmer layout approved, aprovado o layout do alemão - YouTube

Soon he will publish all images needed for you to etch your own Dx Supply at home.

Juan Vargas is also testing his layout...he will do the same..and bother will order manufacturer to produce their pcboards.

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 6th April 2013, 10:04 PM   #105
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Default Now with heatsinks - assemble and test part five - final

Dx Supply - Zimmer layout - start produce & test - part FIVE - YouTube

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 7th April 2013, 08:19 PM   #106
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Default Juan is testing his supply layout too.

Here you have 3 pictures.

regards,

Carlos
Attached Images
File Type: jpg Juan test 1.JPG (594.0 KB, 329 views)
File Type: jpg Juan test 2.JPG (610.4 KB, 296 views)
File Type: jpg Juan test 3.JPG (861.2 KB, 273 views)
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 7th April 2013, 10:05 PM   #107
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Default Studying the Dx Supply, the stabilization

Dx Supply study, estudo da fonte Dx - YouTube

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 8th April 2013, 07:22 AM   #108
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Default Dx Supply, the first model, earlier model

This circuit was developed based into Ampex power supply, used to Video Tape Recorders, Open Reel Professional Video Tape Recorders, in the seventies.

I am using this circuit since they release, i have assemble more than 60 units, some sold to Radio Amateurs..no one complained and this is happening this last 43 years... a long time proving reliability.

This circuit was not able to face the huge current the Dx Super A drains at 2 ohms...also not able to face two channels at 4 ohms....to use 4 ohms we are forced to build two circuits, one supply to each power amplifier channel, reason why i decide to make it stronger and a new model, with more transistors, more capacitors and demanding bigger heatsinks was developed, tested and approved yesterday the Zimmer layout.

Juan Vargas layout is being tested and soon we gonna have results and layouts published after approval.

This circuit, shown into the pictures, is the old one, the first model, the first one, the smaller one...and it is suggested if you will operate 8 ohms only, then it will be able to feed two channels at same time, full power at 8 ohms and even with 10 percent distortion the supply will survive.

But heatsinks must be bigger than this one show that is there only to produce a nice picture..it is too much small....it is there for demonstration purposes only.

To use it you should plug 33 plus 33 volts alternated, with center tap, a 350 to 400 watts power transformer, or 400 VA unit.... that rectified and filtered will result in 46.5 volts DC positive and negative.

You can decrease the wattage ratio or the AC voltage, but do not increase it because power dissipation into the series pass transistors will increase and will put the supply into the risk to be damaged... decreasing voltage is allowable, but understand the output power will also be reduced because you should adjust to have 4.5 volts difference in between the regulator input (rectifier and filter side) to the regulator output (the output condensers)..this means you should adjust to read 4.5 volts in between colector and emitter in the series pass transistors, your multimeter probe points will be at the series pass transistor coletor and emitter to adjust the output voltage that gonna be dependable from the input voltage.

If your supply is 30 plus 30 volts, as an example, your DC rectified and filter will result in something around 42 volts..then you should adjust your output voltage to 37.5 volts and you 8 ohms power will drop from 80 to 55 watts RMS. to each channel, THD 0.003%

You should adjust the output to 42 volts positive and negative rails (never more than that because of the BD139 and BD140)

Heatsink area exposed to the air must be (4.5 volts from colector to emitter or from regulator input to regulator output) 450 square centimeters if you consider only one face (not two faces)..this means a 21 by 21 centimeters aluminum blade (if flat) to each rail..... something around 55 watts heatsink to each rail.

Rectifier bridge should be 20 amperes minimum.

Transistors suggested are the bigger one you can find.... MJL4281A and complementary are the most tested ones that proved to be reliable.

Naturally you can use it together other amplifiers, not only Dx Super A or Dx models, it is just a series pass regulator with error amplifier, a very standard and often used circuit, very popular circuit that can be used together any amplifier...but of course, you should respect the input voltage, also output voltage and recalculate to check if the supply can face your amplifier.

Imagine you adjust it to 14 volts because of an automotive amplifier.... input is 46 volts.... voltage drop into the series pass transistor (one rail thinking) is 36 volts multiplied by 20 amperes (automotive power amplifier)..then the power into the series pass transistors gonna be 720 watts to each rail ( means 1440 considering both rails driven) ..the rectifier will explode, the series pass transistors will melt and the heatsink to use will be to the size of a small refrigerator...so..this supply will not be good to this kind of application...a SMPS is the suggested supply to this automotive power amplifier.

This supply was designed, calculated, assembled and tested, to feed Dx Super A amplifier...this one able to face 400 watts consumption (total positive rail plus negative rail).

The new supply can face 1000 watts easy (both rails), of course if you use correct output transistors, correct transformer, rectifiers, filters and heatsinks.

So, it can be used to several tasks, but you should engage brain in advance or start a conversation with uncle charlie.

This one, in the picture below is 400 watts only...and with these heatsinks it can manage much less than that...the small heatsinks are there only to produce a nice image, a nice picture..they are too much small.

Two of these TO220 transistors should have small heatsinks not shown into the image posted...the left side ones considering the left side image...the rigth side ones are the error amplifier, and the left side ones are composing the output in a darlington connection.

This supply uses power equalizing resistors into the series pass transistor's emitters..value is 0.1 ohms suggested, but you can use 0.22 ohms too...in an emergency you can use 0.33 ohms..but the best option is the 0.1 ohms resistor.

Watch videos of my channel, they are made because of you, in portuguese and english and they are much more rich in information than typed words can be..there you have audio and video...much richer information you can have there.

regards,

Carlos
Attached Images
File Type: jpg Dx Supply - first model 2.JPG (204.3 KB, 242 views)
File Type: jpg Dz Supply - first model 1.JPG (271.7 KB, 74 views)
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 8th April 2013 at 07:42 AM.
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Old 8th April 2013, 08:41 AM   #109
wiljj78 is offline wiljj78  Philippines
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Default Thank you very much Uncle Charlie...

With all the efforts and hard work you have contributed to produce this DX supply deserves another credits from all diy'ers like me, Great Job Uncle Charlie...

BTW, Can you post the approved Zimmer layout in jpg. file so we can have a try...

Thanks for sharing....

Regards,

Last edited by wiljj78; 8th April 2013 at 08:57 AM.
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Old 8th April 2013, 11:37 AM   #110
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Default As soon as i have it i will do it

We gonna have also layout from Juan.

Thank you very much dear Wiljj78.

We really have worked hard and your thanks is something very important to us.

Watch videos because they have a lot of details.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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