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Class D Switching Power Amplifiers and Power D/A conversion

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Old 4th February 2013, 03:01 PM   #101
pravpa is offline pravpa  India
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lycanlk Please check ypur PM.

Regards,
Pravpa
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Old 4th February 2013, 05:35 PM   #102
lycanlk is offline lycanlk  Sri Lanka
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Quote:
Originally Posted by pravpa View Post
lycanlk Please check ypur PM.

Regards,
Pravpa
I'm sorry friend, I don't have any of my past project files since my portable hard disk was stolen by muggers in Croydon, UK. So I lost everything. I came back to Sri Lanka a few months ago and started DIY projects again.

Anyway I will search those project files in my friends PC. If I'd be lucky I will share those for you all.

cheers!
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Old 5th February 2013, 04:50 AM   #103
abetir is offline abetir  Philippines
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Quote:
Originally Posted by manojtm View Post
My AUD600 Rev3.0 is suitable for any type of filter core like T106-2,ETD,EE & EI core with gap and supply voltage range will support like +/-35V to +/-85V and IRFP250N will support fsw up to @500KHz range with cool.my only problem was HF little low (using ETD,EE,EI with gap)compare to LOW and MID,but it is satisfactory.I am not started the PCB yet.

Regards
MANOJ
Hi Manoj,

This sounds very promising...guess I'll have to wait for rev. 3.0 then, but please let us know if it will be shared for DIY'ers in the forum.

Thank You!
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Old 5th February 2013, 08:09 AM   #104
manojtm is offline manojtm  India
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Hi ALL,

My AUD600 Rev 1.1 change to Rev 3.0
First test fsw @460KHz with IRFP250 MOSFET run cool with Mid Volume temp 50 deg. with full drive @ 4 Ohms load.

Regards
MANOJ
Attached Images
File Type: jpg AUD600Rev1.1change2Rev3.0-2 copy.jpg (833.0 KB, 1020 views)
File Type: jpg AUD600Rev1.1Change2Rev3.0-3.jpg (687.4 KB, 914 views)
File Type: jpg AUD600Rev1.1 IRFP250 small H.sink copy.jpg (696.2 KB, 827 views)
File Type: jpg AUD600 fsw copy.jpg (746.5 KB, 715 views)
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Old 5th February 2013, 02:59 PM   #105
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nice work sir....
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Old 5th February 2013, 03:56 PM   #106
pravpa is offline pravpa  India
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Default AUD600 Rev 1.1 change to Rev 3.0

Quote:
Originally Posted by manojtm View Post
Hi ALL,

My AUD600 Rev 1.1 change to Rev 3.0
First test fsw @460KHz with IRFP250 MOSFET run cool with Mid Volume temp 50 deg. with full drive @ 4 Ohms load.

Regards
MANOJ
Manoj Sir,
Pictures of your Amp shows that your work is very neat and clean.
Great Work Sir !!!

Regards,
Pravpa
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Old 5th February 2013, 04:30 PM   #107
IRSound is offline IRSound  Germany
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Nice work Manoj..

what is the main difference with your prevision designs ?
if it's possible , please give schematic to me. i'm working lots of month on class-d , still don't find a reliable design to improve and pcb designing.

Regards
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Old 6th February 2013, 06:38 AM   #108
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Congratulations m friend
nice work
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Old 6th February 2013, 08:49 AM   #109
manojtm is offline manojtm  India
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Quote:
Hi Manoj,
use accurate LCR meter to measure the value of your inductor. maybe your ee type filters don't have enough inductance to reach a good cut-off freq. also as i calculated before , in lower loads , we lost some higher frequency and we should increase cut-off freq.
Hi IR,

Thanks. I changed cut-off freq. settings ; add a 474/400v capacitor now HF is good.

Regards
MANOJ
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Old 6th February 2013, 10:54 AM   #110
IRSound is offline IRSound  Germany
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Manoj,

for best result @4ohm , use 18~20uH + 470nF , the cut-off freq should be higher than 50KHz. but this values are not very good for 8 Ohm loads.

Regards
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