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Old 16th September 2013, 10:27 AM   #991
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Quote:
Originally Posted by Ranchu32 View Post
If you need more power than have a look at Carlos' DX MkIII thread. It has no problems driving 200W into 8R. But you will need a very big transformer: 500VA, 1kVA or more!
And still boards available
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Old 20th September 2013, 12:29 PM   #992
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Default Pcboards already arrived at Juan Vargas home

in Puerto Rico.

Soon you gonna have pictures.

And he will open the group buy.

regards,

Carlos
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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 20th September 2013, 01:37 PM   #993
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Here are some images of the new boards


Regards
Juan
Attached Images
File Type: jpg Dx Super A top.jpg (507.9 KB, 282 views)
File Type: jpg Dx Super A bottom.jpg (481.6 KB, 262 views)
File Type: jpg Dx Regulator top.jpg (548.2 KB, 247 views)
File Type: jpg Dx Regulator bottom.jpg (440.6 KB, 229 views)
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Old 20th September 2013, 08:19 PM   #994
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Default Group buy link

Dx Super A and Dx Regulator Group Buy Interest

Carlos
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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 21st September 2013, 08:05 PM   #995
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Default Juan is already building his own amplifier

regards,

Carlos
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File Type: jpg DSC04145.JPG (948.2 KB, 194 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 22nd September 2013, 07:31 PM   #996
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Hello guys

well I like to share my ideas as always I was simulating how the final project looks like using Google Sketch so I work using millimeters measurements to make the components but some parts I can not make and I use free components from the website data base this is just a "simulation" not and actual way I'm going to do it for me is just reference so you also guys can design your own projects too by seen this help to visualize that, ok here is some images:

I did it as accurate as possible might be a bit different depends on your parts you are going to buy, I hope this help develop more ideas for you guys yes the Dx Regulator will be simulate it too

Regards
Juan
Attached Images
File Type: png Dx Super A montage 3.PNG (223.1 KB, 319 views)
File Type: png Dx Super A montage 4.PNG (193.7 KB, 88 views)
File Type: png Dx Super A montage 5.PNG (290.7 KB, 76 views)
File Type: png Dx Super A montage 6.PNG (253.6 KB, 78 views)
File Type: png Dx Super A montage 7.PNG (133.1 KB, 74 views)
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Boards on hand, group buy started
http://www.diyaudio.com/forums/group...-interest.html

Last edited by vargasmongo3435; 22nd September 2013 at 07:34 PM.
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Old 22nd September 2013, 08:07 PM   #997
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If I am doing the math correctly, that heatsing is 12" x 5-1/2". I know you guys have built quite a few of these. Is that enough heatsink for both channels? Also, how much heatsink will the power supply require?

Thanks, Terry
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Old 22nd September 2013, 08:43 PM   #998
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Default I cannot suggest a heatsink model code Terry...because i use other

method to calculate a heatsink dimension.

but i can make a study, considering a worst case scenario.... so...if you apply, you will have your supply series pass transistors heatsink warm...with less than 10 degrées celsius above the environment temperature.

The size depends on the impedance...or the power your amplifier will drain from the supply.

Here you have something that may help.

regards,

Carlos
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File Type: jpg Dx Power supply dissipation.jpg (609.6 KB, 67 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 22nd September 2013, 09:08 PM   #999
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Default Dx Super A heatsink

Here you have something that may help.

regards,

Carlos
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File Type: jpg Dx Super A heatsinks.jpg (287.2 KB, 51 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 22nd September 2013, 10:43 PM   #1000
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Hi Carlos,

I'm sorry, but I don't understand how to do calculations for heatsinks. I was a carpenter by trade. I understand feet and inches but not dissipation.

What I hope to use is my Antek 5225 transformer. It puts out +/-40Vdc with regular bridge/filter on my house outlet. Do you think this will suffice for the Super A? If so, what size heatsink do you think I will need. I am not looking to blast out the windows of my house. I have many powerful amps, including the MKIII that I am currently building. I am looking to use this amp for normal listening levels through no lower than 4 ohm speakers.

Thanks, Terry
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