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Old 23rd December 2012, 03:33 PM   #11
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Default I have assembled...working great

we can arrange the range of adjustment, also the input voltage...you can use any power transistor into the output, naturally this will depend on your transformer power to select the unit...not only current, but also voltage and dissipation..but it is not critical and almost any transistor will fit.

regards,

Carlos
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File Type: jpg 001.JPG (589.6 KB, 966 views)
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Old 26th December 2012, 06:25 AM   #12
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Hey Carlos, will I be able to use this with an LM4780 Based Chipamp?, thank you.
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Old 26th December 2012, 06:45 AM   #13
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Default I do think you can..... well... i will make it fit into your needs

Please, inform the maximum current your chip will drain...also if you will use two integrated circuits feeded by a single power supply.... inform the maximum power when distorting and if possible the maximum current and the supply voltage you need.

Inform if you will use 8 ohms, 4 ohms or if you will use some crazy speakers that uses internal passive crossover...also your application.

Will be for home use?
Will be for professional use... as Public Adress or to put sound on parties/games or other events.?

Do your use full power... are you addicted to full power..distorted sounds?... do you plug guitar, bass guitar and synthetizer in your amplifiers?

Sending me these information i will inform you the power transformer to be used and i will match the supply to your needs (if modifications needed)

I know nothing about Integrated Circuits... and i am afraid you will not be able to inform correct data about... datasheet of these things are not that precise...let's say they are too much optimistic.

I have used this supply these last couple of days.... i do think will work fine to you too..it is a very good power supply...here last movies about:

http://www.youtube.com/watch?v=FSzvvO5phWw
http://www.youtube.com/watch?v=mg6hXbYzaD0
http://www.youtube.com/watch?v=KpkSgIuPgzs
regards,

Carlos
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 26th December 2012 at 06:54 AM.
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Old 26th December 2012, 07:32 AM   #14
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Thanks for the reply carlos

It's a 60W by 60W Chip from +-35V, I will use two 8ohm Bookshelves with it, and it's for personal use, No I don't intend to use the full power. My primary amplifier is your DXblame ST with a -+24V power supply, I love it, best sound ever, this chipamp is just an experiment to make a bi-amped system, I intend to use a 40v40 500VA Transformer for this.

Unrelated---My DXBlame ST

Click the image to open in full size.
Click the image to open in full size.

Last edited by zeraphine; 26th December 2012 at 07:49 AM.
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Old 26th December 2012, 10:46 AM   #15
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Default Yes...it will be good for channels operating full power.... to the Blame and also

to your Chip amplifier.

Juan is finishing the layout (some small touches on it), reducing the pcboard size and soon it will be available.

40 volts AC?... this is 56 volts DC... this way using the Blame, adjusted to 35 volts you will have 21 volts into the series pass transistors....full power at 4 ohms you will need 5 amperes to each rail...so... 105 watts dissipation...no problems....supply will do the job laughing, easy and without any worries.

Also to adjust to 30 volts you will have an excellent power supply.

We are working to reduce the board size.... schematic being modified in order to reduce parts count... we are working on that today.... Juan may fix and soon you gonna have layout ready to go.



Go ahead that you will be very happy with it... tested with the Dx Blame amplifiers and worked great!

regards,

Carlos
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__________________
Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 26th December 2012 at 10:59 AM.
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Old 26th December 2012, 07:01 PM   #16
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Thanks a lot Carlos, I will wait for the PCB layout
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Old 30th December 2012, 10:44 AM   #17
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Question Measuring results

Hi Carlos,

Did you already measure the PSRR in your test setup?
And what about the output noise?

Regards,
John
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Old 30th December 2012, 03:16 PM   #18
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Default Here you have a test video in english only.

No gusto...i have not measured....but i could see the electronic filtering from the Dx supply almost have killed all noise....i coupled a speaker with a huge condenser and connect the one to the supply output...in the electronic supply input the noise was huge....in the output (loaded) no noise was listened till i touch the speaker into my ear.... there i could see there's a small hum....but really seems to be something that might be 50 db down.

My scope is damaged..no way to make sophisticated measurements.....also i do not know how to make them.

Here you have a video....in English...made today....there's one in portuguese too in my channel:

Dx Symetrical, stablized and adjustable power supply nnnn - YouTube

regards,

Carlos
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 30th December 2012 at 03:19 PM.
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Old 19th January 2013, 09:19 PM   #19
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Default I have already tested the layout...now making more pcboards

Preparing Dx Supply pcboards at home - YouTube

I am asking Juan to post here the black and white layout for you to etch.

Thank you Zeraphine.

regards,

Carlos
__________________
Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 19th January 2013 at 09:21 PM.
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Old 19th January 2013, 09:43 PM   #20
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Here are the files need it.


Regards
Juan
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File Type: jpg Dx Regulated Power Supply top.JPG (859.9 KB, 380 views)
Attached Files
File Type: pdf Dx Regulated Power Supply cut etching 1.pdf (22.6 KB, 226 views)
File Type: pdf Dx Regulated Power Supply cut etching 2.pdf (22.6 KB, 211 views)
File Type: pdf Dx Regulated Power Supply info view.pdf (48.8 KB, 274 views)
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