I am proud to announce the Dx-M, 300 wiskies of power with a very low distortion - diyAudio
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Old 1st December 2009, 09:08 AM   #1
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Default I am proud to announce the DXM, 300 wiskies of power with a very low distortion

Based into the Dx HRII, the DXM (Dx-M) will have the so loved CCS into the differential amplifier (market pressure), also current sink.

Second stage, the VAS, use dual transistors

The amplifier continue bootstrapped, of course!

Will study some different style of protection (Sakis wants that for professional applications) and will be tuned for SONICS during this last month of 2009...will be my Christmas gift to all forum friends.

Dx-M is easy to pronounciate, despite in my mind it will be Dx sonics, will not be released if not able to beat 90 percent of forum amplifiers and commercial amplifiers (related sonics)

Supply voltage will be around 80 volts...and power can reach 400 watts without too much trouble to that,but really it will be rated 200 W at 8 ohms

Distortion is around 0.003% (THD) at full power, fourier analisis is clean and will be able to face 2 ohms loads having 2.2uf in paralell.

I am working, and soon you gonna see prototype and final schematic posted.

Competition!..watch your back cushion shock absorbers because Dx will star to kick some....

Merry Christmas folks!

regards,

Carlos
Attached Images
File Type: jpg wanna 0.0035 distortion.jpg (437.9 KB, 511 views)
File Type: jpg wanna a fourier analisis this way.jpg (128.8 KB, 466 views)
File Type: jpg With such a low distortion at 4 ohms!.jpg (120.1 KB, 452 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st December 2009 at 09:35 AM.
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Old 1st December 2009, 09:11 AM   #2
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Default The amplifier will be based into the Dx HRII, that was based into the

Dx amplifier and referenced into Aksa products.

The HRII schematic is here:

Greg's Web Site

DIY group of skilled designers!...watch your back... keep back bumpers against the wall...more protected as accidental crashes happens!


hehehehhe

Carlos
Attached Files
File Type: pdf Dx HRII.pdf (159.0 KB, 175 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st December 2009 at 09:14 AM.
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Old 1st December 2009, 12:24 PM   #3
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Default I am preparing the DXM enclosure

Soon will start to assemble prototype and to research protection...well, will try a protection if the one does not kill sonics.

I am having a lot of fun.... i love to build amplifiers!

regards,

Carlos
Attached Images
File Type: jpg Preparing DXM.jpg (506.6 KB, 418 views)
File Type: jpg Preparing DXM - c.jpg (379.5 KB, 384 views)
File Type: jpg Preparing DXM -b.jpg (515.2 KB, 97 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st December 2009 at 12:27 PM.
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Old 1st December 2009, 01:11 PM   #4
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Default Well, already simulated the basic schematic and will go to assemble tomorrow

Today will prepare the board, will be prototype style, a lot of square blocks or copper.

For now, the good life, listening the Dx TriAmp while i am thinking what to do first.

regards,

Carlos
Attached Images
File Type: jpg Começando o DXM.jpg (855.8 KB, 95 views)
File Type: jpg Listening the TriAmp.jpg (822.0 KB, 136 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 1st December 2009, 01:25 PM   #5
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by destroyer X View Post
Second stage, the VAS, use dual transistors
This feature gets my vote.
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
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Old 1st December 2009, 04:44 PM   #6
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Default I have used into the HRII and also Precision 1 a long time ago

Now will continue to use into the top performance amplifiers (Dx line)

watch the HRII schematic and you gonna see the 2 stage VAS.

DXM will be based into this one, with some modifications.

Already simulated, now will go to assemble and to listen..and this is what matters...into simulators they use to be wonderfull, when playing not always.

Carlos
Attached Files
File Type: pdf Dx HRII.pdf (159.0 KB, 82 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st December 2009 at 04:48 PM.
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Old 1st December 2009, 04:52 PM   #7
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Default The method i use to fast produce squared islands boards

Alike na universal circuit board, the one with holes and a lot of squared pieces of copper.

The fast way to produce prototypes...also has the advantage that you solder into the copper side, this way no shorts bellow the board...and we know the mess while we are assembling, this happens.... having board insulated, will not happens shorts and you will see the circuit the way it is, nothing inverted and nothing needing you to rotate the board to inspect copper lines to follow the circuit..this way everything is in front of you eyes...connection lines, parts and solder.

Here is a small video..sorry the bad quality, my camera is not fine....but you may understand and may use the method.

I use to do this way since 1969.... so, if this is SMD, then i am the one have invented SMD

YouTube - How to create square islands into copper board.avi

ahahahahahah!

regards,

Carlos
Attached Images
File Type: jpg DXM will use analogic meter.jpg (574.0 KB, 92 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st December 2009 at 05:00 PM.
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Old 1st December 2009, 05:59 PM   #8
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Default Board is ready to go.

regards,

Carlos
Attached Images
File Type: jpg Doing.jpg (279.8 KB, 39 views)
File Type: jpg 324 connection points.jpg (215.8 KB, 70 views)
File Type: jpg Board detail.jpg (87.7 KB, 69 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 1st December 2009, 06:06 PM   #9
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Default Here is the board solder points close up

Not a good idea to remove the solder flux for a while.... if you remove will be easy to produce shorts between the solder points, the flux keeps some surface tension that avoids shorts.

Clean flux after finish all construction and test.... cleaning is final thing to be done, the flux removal.

regards,

Carlos
Attached Images
File Type: jpg Big close.jpg (244.5 KB, 66 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 2nd December 2009, 03:53 AM   #10
taj is offline taj
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It's nice to see you add to the DX product line, Carlos. This project is a good size for the chassis, heatsink, transformer pair I have waiting in the wings. How many output pairs are you thinking about (c5200/a1943)? 5-6 maybe?

..Todd
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