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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd June 2013, 10:21 AM   #351
stewin is offline stewin  Kenya
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hi all . i modified the smps to use with the aud 900 . i made it to fit 3u space so as to easy mounting. i brought the ic closer to the output fets.
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Old 23rd June 2013, 04:35 AM   #352
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Hi ,

Great work , could you please drop a mail to dasgupta.s@outlook.com
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Old 23rd June 2013, 10:30 AM   #353
stewin is offline stewin  Kenya
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Quote:
Originally Posted by nigelwright7557 View Post
1/ Join all the audio ground together.
2/ Join all the power supply grounds together.

Take track from the audio ground to the edge connector where ground comes in.
This now the star ground point.
Take a track from the power supply ground to the same point.

Words explain it better than a picture.

I have used this technique on 4 audio systems now and never had a hum problem.
thanks nigel i did exactly the above and the amp was silent and i was using smps and class d
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Old 23rd June 2013, 10:37 AM   #354
stewin is offline stewin  Kenya
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Quote:
Originally Posted by Tekko View Post
That will not work, it will blow up in your face because the gate driver is a mile away from the switching fets, even if its only a 20kHz smps, the IR2110 needs to be as close to the fets as physically possible.
hi all . i modified the smps to use with the aud 900 . i made it to fit 3u space so as to easy mounting. i brought the ic closer to the output fets.


>>>>>>>>>>>for more power use igbt as outputs and increase the switching frequency by changing sg3525 rt resistor r14 from 10k to about 4.7k <<<<<<<<

Last edited by stewin; 23rd June 2013 at 10:54 AM.
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Old 23rd June 2013, 11:18 AM   #355
exflaco is offline exflaco  Armenia
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Good job Stewin a boss diyers space share pictures your design and oscilogram please
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Old 23rd June 2013, 03:06 PM   #356
stewin is offline stewin  Kenya
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for making the former coiling. instruction you can use the below lay out
Attached Images
File Type: jpg ETD49-Spec_001.jpg (179.1 KB, 558 views)
Attached Files
File Type: pdf ETD49-Spec.pdf (80.4 KB, 146 views)
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Old 23rd June 2013, 03:35 PM   #357
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Never before have i seen smps transformers with primary and secondary interleaved like that.
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Old 23rd June 2013, 03:57 PM   #358
stewin is offline stewin  Kenya
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what way do you suggest ? i used the method for long and works .but please post a more efficient way . i am much interested

also good news diysmps

Last edited by stewin; 23rd June 2013 at 04:07 PM.
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Old 23rd June 2013, 03:59 PM   #359
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I just meant i have never seen pri and sec interleaved in any of the smps transformers i've unwound so far.

I suppose there are advantages like lower leakage inductance and such.
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Old 23rd June 2013, 04:13 PM   #360
stewin is offline stewin  Kenya
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Quote:
Originally Posted by Tekko View Post
I just meant i have never seen pri and sec interleaved in any of the smps transformers i've unwound so far.

I suppose there are advantages like lower leakage inductance and such.
also there is another efficient way of coiling which is bi-filiar winding. but the tricky part is to use high quality wires because the primary and secondary are twisted together .
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