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Class D Switching Power Amplifiers and Power D/A conversion

My class D amp
My class D amp
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Old 25th July 2013, 09:44 PM   #421
stewin is offline stewin  Kenya
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Join Date: Jul 2007
hi all pictures of the smps

i added the primary turns so as to cool the outputs . i pushed it a bit hard without a heatsink both for the outputs ,the 7815,and the diodes rbv5006 and the mur1560 except a small heatsink to the mje350
Attached Images
File Type: jpg SAM_2674.JPG (968.7 KB, 1069 views)
File Type: jpg SAM_2672.JPG (947.4 KB, 902 views)
File Type: jpg SAM_2671.JPG (951.3 KB, 735 views)
File Type: jpg SAM_2670.JPG (946.0 KB, 651 views)
File Type: jpg SAM_2656.JPG (961.3 KB, 732 views)
File Type: jpg SAM_2645.JPG (938.6 KB, 383 views)
File Type: jpg SAM_2657.JPG (938.5 KB, 248 views)
Attached Files
File Type: pdf smps half bridge irfp460 smps 3u space high power components.pdf (867.6 KB, 587 views)
File Type: pdf smps half bridge irfp460 smps 3u space high power schematic .pdf (35.6 KB, 438 views)
File Type: pdf smps half bridge irfp460 smps 3u space high power pcb artwork.pdf (245.5 KB, 459 views)

Last edited by stewin; 25th July 2013 at 09:55 PM.
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Old 26th July 2013, 05:31 PM   #422
NMOS is offline NMOS  Germany
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Default SMD for 1N4148 and 2N5401

I want make SMT/SMT Board

Does somebody know what is SMD/SMT part device number for

1N4148

2N5401

BYV27 or UF4004

MPSA 42 and 92


Thank you
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Old 26th July 2013, 08:01 PM   #423
stewin is offline stewin  Kenya
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1n4148-bav99
2n5401-mmbt5401
byv27/uf4004 - murs120
mpsa42&92 try mmbt5401&mmbt5551
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Old 26th July 2013, 08:33 PM   #424
ChocoHolic is offline ChocoHolic  Germany
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Location: Munich
1. My honest congrats.
2. In the region of the wide isolation barrier, please scratch away the thin copper lines at the sides of the PCB. In the moment this copper line effectively jumpers most of the creepage distance, because it is a conductor which is very close to the primary and also very close to the secondary.
3. Take care with the creepages also in the transformer.
4. Check if the blue cap across the barrier has Y1 rating.
5. Enjoy your build! Great to see your walk of success.

Disclaimer:
My safety hints are based on my best personal knowledge, but I cannot
guarantee regarding potential errors.
Also there is no way to give full information about safety standards by a few posts. Also there is no way to notice all short comings.
It is just an attempt to reduce potential safety issues, which I noticed while zapping through the forum.
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Old 27th July 2013, 07:55 AM   #425
stewin is offline stewin  Kenya
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Quote:
Originally Posted by ChocoHolic View Post
1. My honest congrats.
2. In the region of the wide isolation barrier, please scratch away the thin copper lines at the sides of the PCB. In the moment this copper line effectively jumpers most of the creepage distance, because it is a conductor which is very close to the primary and also very close to the secondary.
3. Take care with the creepages also in the transformer.
4. Check if the blue cap across the barrier has Y1 rating.
5. Enjoy your build! Great to see your walk of success.

Disclaimer:
My safety hints are based on my best personal knowledge, but I cannot
guarantee regarding potential errors.
Also there is no way to give full information about safety standards by a few posts. Also there is no way to notice all short comings.
It is just an attempt to reduce potential safety issues, which I noticed while zapping through the forum.
thanks chocoholic much appreciated GOD bless .
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Old 27th July 2013, 03:02 PM   #426
ChocoHolic is offline ChocoHolic  Germany
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Location: Munich
Hope I am not annoying you and other DIYers with my safety topics.
Safety standards are full of pitfalls.
Our company has an entire department of specialized engineers, who do nothing but checking and early consulting the design engineers on safety topics. No, I am not one of these specialized safety engineers.

..ohps just seeing now, the tape around the ferrite core should be wider.
Again the same topic - the ferrite comes close the primary and the secondary PCB.
My proposal: Make the tape much wider than the transformer (i.e. 6mm on each side) and have it 3 layers at least. I know that's looking ugly.

Keeping fingers crossed that the inside transformer construction provides sufficient isolation, cannot judge this from the distance.
Fundamental rule for you to check:
Imagine the currents wants to creep from primary to secondary along any surface.
Also indirect path which incorporate conductive parts like unconnected copper or ferrite are critical. I.e. Primary ==> core ==> secondary.
Distances along the surface of conductive material are no creepage, because the conductive material jumpers this distance.
Whereever you find a path which has less than 5-8mm creepage over isolating material, you should think how to enlarge.
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Old 27th July 2013, 06:00 PM   #427
stewin is offline stewin  Kenya
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thanks markus i highly and deeply appreciate the safety concerns . i will change the tape insullation and post pictures

much regards steve
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Old 29th July 2013, 04:34 PM   #428
NMOS is offline NMOS  Germany
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Have another problem:

My Class D Board same like AUD600 but without TL072 Balanced Input stage.

Signal goes direct into TL071, have Poti 47K for Volume control before TL071 Input

If I conncet 2 Class D Board with my PC SOUNDCARD
and close POTI (no music can comes out)

then I have ground noise in speaker and cant find a way to fix it.?

If I connect 2 Class D Board with Samsung Galaxy S3 no have noise
if close POTI (no music can comes out)

It look like soundcard modulate input stage from class d board

Any idea to solve this problem ?
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Old 29th July 2013, 04:47 PM   #429
ravpreet420 is offline ravpreet420
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in aud600 vol. stage use without gnd. ..if u wanted use input stage without tl072/5532 then use volume with refference gnd. connection.......try it
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Old 30th July 2013, 05:31 AM   #430
manojtm is offline manojtm  India
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Quote:
Have another problem:

My Class D Board same like AUD600 but without TL072 Balanced Input stage.

Signal goes direct into TL071, have Poti 47K for Volume control before TL071 Input

If I conncet 2 Class D Board with my PC SOUNDCARD
and close POTI (no music can comes out)

then I have ground noise in speaker and cant find a way to fix it.?

If I connect 2 Class D Board with Samsung Galaxy S3 no have noise
if close POTI (no music can comes out)

It look like soundcard modulate input stage from class d board

Any idea to solve this problem ?
Hi NMOS,

Connect sig GND to Main GND (star) Point

Regards
MANOJ
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